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Dual 2.5" vs Single 3" exhaust #1223219 04/27/12 08:55 PM 04/27/12 08:55 PM
Joined: Nov 2011 Posts: 2,154 Its a TRAP! DARTH V8Я OP Oh No!! I just had a moron attack!
DARTH V8Я OP Oh No!! I just had a moron attack! Joined: Nov 2011 Posts: 2,154 Its a TRAP!	So, which would make more horsepower/torque in both peak and 'under the curve' in a typical NA smallblock? Right now I'm leaning towards a single 3" in my application, but if need be I could squeeze in a dual 2.5" exhaust. Thanks. When it takes more than a sweet mullet to prove you rule at the trailer park..

Re: Dual 2.5" vs Single 3" exhaust [Re: DARTH V8Я] #1223220 04/27/12 10:43 PM 04/27/12 10:43 PM
Joined: Jan 2008 Posts: 4,254 Canada WO23Coronet master
WO23Coronet master Joined: Jan 2008 Posts: 4,254 Canada	Depends. Are you talking about a 11:1, big cam, NA small block, or a stock 5.2 Magnum? Sounds like you're dealing with a truck since you're even considering a single exhaust. BUT the dual 2.5" will give you more HP potential over a single 3", it definitely won't hurt performance, even in a mild application. So if you can squeeze the duals in I say do it

Re: Dual 2.5" vs Single 3" exhaust [Re: WO23Coronet] #1223221 04/27/12 11:12 PM 04/27/12 11:12 PM
Joined: Oct 2003 Posts: 21,345 Marysville, O-H-I-O 70Cuda383 Too Many Posts
70Cuda383 Too Many Posts Joined: Oct 2003 Posts: 21,345 Marysville, O-H-I-O	the dual system will give you the best of both worlds. your pipes will be small enough to keep velocity/scavenging up at lower RPM for better torque, but by having 2 pipes, you can still get high RPM flow out of them. 2 2.5" pipes have a lot more cross sectional area and flow potential than a single 3" pipe. but, for a truck (assuming that's what this is on since your asking about duals vs single) it can sometimes be tricky routing a true dual system, especially if it's a newer truck where the tank hangs inside the frame rail, in front of the rear axle, forcing your driver side exhaust to cross over to the passenger side. how "big" is your engine? a single 3" system will still support a TON of Hp. my engine is only lightly modded, and put down 300 hp to the wheels, I do not feel like my exhaust is the limiting factor, or anywhere near choking me down yet. my exhaust will flow more than my heads will Photobucket sucks

Re: Dual 2.5" vs Single 3" exhaust [Re: 70Cuda383] #1223222 04/28/12 12:04 AM 04/28/12 12:04 AM
Joined: Nov 2011 Posts: 2,154 Its a TRAP! DARTH V8Я OP Oh No!! I just had a moron attack!
DARTH V8Я OP Oh No!! I just had a moron attack! Joined: Nov 2011 Posts: 2,154 Its a TRAP!	The motor is about 331 cubic inches. The problem is that the spare tire well drops down in the trunk, and the gas tank occupies the space beside it. I could put dual 2.5's that exit in front of the rear fenderwells, with a couple 'bullet' style mufflers side by side. I know for sure a 3" pipe will route the like original exhaust did, and I can use a sideways mounted flowmaster 3" in/out muffler. Shooting for about 400hp @ the flywheel. When it takes more than a sweet mullet to prove you rule at the trailer park..

Re: Dual 2.5" vs Single 3" exhaust [Re: DARTH V8Я] #1223223 04/28/12 01:02 AM 04/28/12 01:02 AM
Joined: Sep 2003 Posts: 1,168 Vancouver, WA MoparMarq super stock
MoparMarq super stock Joined: Sep 2003 Posts: 1,168 Vancouver, WA	What's the vehicle? That might get you some better answers by folks who've been there, done that...

Re: Dual 2.5" vs Single 3" exhaust [Re: DARTH V8Я] #1223224 04/28/12 09:32 AM 04/28/12 09:32 AM
Joined: Oct 2003 Posts: 21,345 Marysville, O-H-I-O 70Cuda383 Too Many Posts
70Cuda383 Too Many Posts Joined: Oct 2003 Posts: 21,345 Marysville, O-H-I-O	with properly sized headers that go into a single 3" system, you'll easilly make 400 crank hp. My Dakota has the worst headers on the market on them. $120 "shortys" that bolt to the factory down pipes...they are marginally better than the stock manifolds, especially since they are about as compact as the factory manifolds. it then flow through some 2" pipe that dumps into a 3" single run that's about 5 feet long. I put 295 hp and 330 tq to the wheels, so that's up around the 375-400 ball-park on crank hp, and Like I said, my heads are what's holding me back now, not my exhaust. Photobucket sucks

Re: Dual 2.5" vs Single 3" exhaust [Re: 70Cuda383] #1223225 04/28/12 10:17 AM 04/28/12 10:17 AM
Joined: Feb 2009 Posts: 773 Crofton, Ky. R rattler super stock
rattler super stock R Joined: Feb 2009 Posts: 773 Crofton, Ky.	I'll give you the numbers to compare. A set of dual 2 1/2 pipes have a combined surface area of 9.8175 inches, while a single 3 inch pipe has a surface area of 7.0686 inches. Thats quite a bit of difference. 1957 Dodge truck, Snakeskin Green with a little stroker motor. 1964 Plymouth Savoy wagon ( my new project)

Re: Dual 2.5" vs Single 3" exhaust [Re: 70Cuda383] #1223226 04/28/12 11:03 AM 04/28/12 11:03 AM
Joined: Nov 2011 Posts: 2,154 Its a TRAP! DARTH V8Я OP Oh No!! I just had a moron attack!
DARTH V8Я OP Oh No!! I just had a moron attack! Joined: Nov 2011 Posts: 2,154 Its a TRAP!	Thanks guys, and thanks 70Cuda383 for the real world info.Headers are Sanderson Shorty Headers which will utillize a 3" Y-pipe into a 3" single with Hi-flow cat & muffler to the back. I think thats the route I'll go. Thanks again guys. When it takes more than a sweet mullet to prove you rule at the trailer park..

Re: Dual 2.5" vs Single 3" exhaust [Re: DARTH V8Я] #1223227 04/28/12 12:03 PM 04/28/12 12:03 PM
Joined: Jan 2008 Posts: 4,254 Canada WO23Coronet master
WO23Coronet master Joined: Jan 2008 Posts: 4,254 Canada	BTW, what vehicle is this? Just out of curiosity, always like to hear what people are working on.

Re: Dual 2.5" vs Single 3" exhaust [Re: rattler] #1223228 04/28/12 12:14 PM 04/28/12 12:14 PM
Joined: Jan 2005 Posts: 12,419 Kalispell Mt. HotRodDave I Live Here
HotRodDave I Live Here Joined: Jan 2005 Posts: 12,419 Kalispell Mt.	Quote: I'll give you the numbers to compare. A set of dual 2 1/2 pipes have a combined surface area of 9.8175 inches, while a single 3 inch pipe has a surface area of 7.0686 inches. Thats quite a bit of difference. I think you mean cross sectional area not surface area. Those duals have a ton more surface area in the pipes to create friction witch resists flow. Also because the cross section is so much higher in the duals it loses velocity. If you had two exhaust systems of equal cross section then the single would make more power. The single would also be more balanced and scavenge better, sort of like an X pipe but it don't seperate back appart. A single exhaust with an equal cross section will have more velocity, flow and HP. Your examples are not equal though. I am not causing global warming, I am just trying to hold off a impending Ice Age!

Re: Dual 2.5" vs Single 3" exhaust [Re: DARTH V8Я] #1223229 04/28/12 01:37 PM 04/28/12 01:37 PM
Joined: May 2008 Posts: 5,399 Aurora, Colorado 451Mopar master
451Mopar master Joined: May 2008 Posts: 5,399 Aurora, Colorado	Not sure if this would help in your application, but I put dual 2-1/4" from the manifolds into a dual inlet / single 3" out IMCO (Flomaster type) muffler on my '86 Ram W150. It sounds really nice too.

Re: Dual 2.5" vs Single 3" exhaust [Re: HotRodDave] #1223230 04/28/12 04:43 PM 04/28/12 04:43 PM
Joined: Oct 2003 Posts: 21,345 Marysville, O-H-I-O 70Cuda383 Too Many Posts
70Cuda383 Too Many Posts Joined: Oct 2003 Posts: 21,345 Marysville, O-H-I-O	Quote: Quote: I'll give you the numbers to compare. A set of dual 2 1/2 pipes have a combined surface area of 9.8175 inches, while a single 3 inch pipe has a surface area of 7.0686 inches. Thats quite a bit of difference. I think you mean cross sectional area not surface area. Those duals have a ton more surface area in the pipes to create friction witch resists flow. Also because the cross section is so much higher in the duals it loses velocity. If you had two exhaust systems of equal cross section then the single would make more power. The single would also be more balanced and scavenge better, sort of like an X pipe but it don't seperate back appart. A single exhaust with an equal cross section will have more velocity, flow and HP. Your examples are not equal though. All that is true. dual pipes will have MUCH more surface area inside the pipe, creating more boundary layer turbulance/friction and resistance to flow. a dual 2 1/8" pipe is about equal in cross sectional area to a single 3" pipe. I would think the dual 2.125" system would have more low end torque, and still maintain the same higher RPM hp of the single 3" system. I've always read that smaller pipes will have more velocity, more torque, but will not support high RPM flow requirements. Especially with header primary sizes. if a smaller primary size gives more low end torque/scavenging because of the increased velocity of the flow, but will become "stuffed up" and not support high RPM hp, then why would that not apply to the full system? Photobucket sucks

Re: Dual 2.5" vs Single 3" exhaust [Re: 70Cuda383] #1223231 04/28/12 11:57 PM 04/28/12 11:57 PM
Joined: Nov 2011 Posts: 2,154 Its a TRAP! DARTH V8Я OP Oh No!! I just had a moron attack!
DARTH V8Я OP Oh No!! I just had a moron attack! Joined: Nov 2011 Posts: 2,154 Its a TRAP!	I think the reason is becouse fluids follow a different set of rules then gasses in terms of flow. By that I mean fluids produce more friction then gasses. Quote: I think you mean cross sectional area not surface area. Those duals have a ton more surface area in the pipes to create friction witch resists flow. Also because the cross section is so much higher in the duals it loses velocity. If you had two exhaust systems of equal cross section then the single would make more power. The single would also be more balanced and scavenge better, sort of like an X pipe but it don't seperate back appart. A single exhaust with an equal cross section will have more velocity, flow and HP. Your examples are not equal though This is a very reasonable explanation. I would like to see a dyno test between a dual 2.5" vs a 3" system, but I cant find any examples. Car in question is a 73 Vega, but I'm sure this theory has universal applications When it takes more than a sweet mullet to prove you rule at the trailer park..

Re: Dual 2.5" vs Single 3" exhaust [Re: DARTH V8Я] #1223232 04/29/12 12:40 AM 04/29/12 12:40 AM
Joined: Sep 2003 Posts: 1,168 Vancouver, WA MoparMarq super stock
MoparMarq super stock Joined: Sep 2003 Posts: 1,168 Vancouver, WA	Quote: I think the reason is becouse fluids follow a different set of rules then gasses in terms of flow. By that I mean fluids produce more friction then gasses. False. As far as the engineering is concerned, the same equations apply for fluid mechanics. Fluid in these terms can be a liquid or a gas. The difference in this case was touched on by HotRodDave in his use of the term "surface area". All other things being equal, two pipes of the same "cross section area" would be sized at about 71% of the diameter of a single pipe (1 / square root of 2). Nearest real world comparo is single 3" vs. dual 2-1/4". In theoretical terms, the dual exhaust (at 71% diameter, or 2.14") will have 1.4 times the "surface area" (the outside of the pipe) for heat loss to the atmosphere prior to exiting the tailpipe. Heat loss slows velocity. This makes the comparison between given cross section area size pipes a comparison between apples and oranges.

Re: Dual 2.5" vs Single 3" exhaust [Re: MoparMarq] #1223233 04/29/12 01:09 AM 04/29/12 01:09 AM
Joined: Sep 2010 Posts: 240 fredericksburg virginia M mopwrd340 enthusiast
mopwrd340 enthusiast M Joined: Sep 2010 Posts: 240 fredericksburg virginia	If you can still find them my friend had a vega with headers and sidepipes made for a vega . he bought it as a kit sounded good to i beleive it was 2 and a half inch pipes ,

Re: Dual 2.5" vs Single 3" exhaust [Re: mopwrd340] #1223234 04/29/12 10:25 AM 04/29/12 10:25 AM
Joined: Jul 2007 Posts: 271 MO, USA Tom Hand enthusiast
Tom Hand enthusiast Joined: Jul 2007 Posts: 271 MO, USA	Here are my thoughts and theories on this. Don't forget that with all the cylinders tied together, any reversion is going to be worse, in other words if you install a relatively restrictive chambered style muffler, the feedback (reversion) from the single exhaust that tends to restrict the intake will be worse than if you have an isolated, dual-pipe system because now you have all 8 cylinders acting on the one that happens to be exhausting at the time. A higher flowing muffler will likely not hurt as much but the location of the junction may be more important. Granted crossovers tend to tie both sides together but not in the same way at the manifolds as a larger single large pipe. I think if you keep the pipes split all the way to the back then combine them, it may act differently than if you tie them together at the front and run one single all the way. Plus with dual mufflers you can lower (quiet) the exhaust sound level even more due to the added volume of the two muffler bodies. Always remember, you want volume in the mufflers to get the most sound control. If you have multiple pipes feeding/traversing through a muffler, that takes away volume you can depend on for noise/sound absorption.

Re: Dual 2.5" vs Single 3" exhaust [Re: Tom Hand] #1223235 04/29/12 01:20 PM 04/29/12 01:20 PM
Joined: Jan 2005 Posts: 12,419 Kalispell Mt. HotRodDave I Live Here
HotRodDave I Live Here Joined: Jan 2005 Posts: 12,419 Kalispell Mt.	Then why not run 8 single exhaust systems Headers are takeing advantage of tuneing, collectors are also needed for this tuneing, the rest of the exhaust system is primarily dealing with just flow. If you understand what is really going on with a tuned length header/collector you will understand why they are run together... the piston forces exhaust out in one big "lump" really fast, this "lump" goes flying past the end of the pipe of the next pipe in the firing order, as that mass of exhaust flies past the other pipe the inertia it has pulls a vaccume on the adjacent pipe, if that pipe is just about to dump the exhaust then the first lump will help pull it out of that pipe, it is the venturi effect. In a normal V8 there is an un even firing order from side to side so you get two lumps really close together, this is where the X pipe comes in, or the old fashioned less effective H pipe. It allows that big supper lump to bleed from one side to the other and allows scavenging from one side to the other, now the ultimate exhaust would be to join the two pipes into one at just the right time for the two big lumps to help pull each other out the entire length of the pipe in a single exhaust configuration. After a certain point in the system there is gonna be no significant tuneing effect and simply raw flow numbers are gonna make the most HP and a single pipe with the same cross section as a dual system will flow more, then it becomes a matter of packageing the system and most cars will have a hard time fitting a single 3.5 inch pipe with out dragging the ground or bending it too tight, this is the only reason dual exhaust became popular for high power machines. A dual system has more heat loss due to surface area than an equal cross section single and heat loss costs HP also. Now there is gonna come a point where simply raw flow rules supreme even over scavenging but that is top fuel territory (not even nascar or F1) where 8 single exhaust pipes rule but even then they still tune with the primary lengths instead of just running the exhaust right out of the head. Here is how scavenging works http://www.youtube.com/watch?v=pzhM9e5ZpbA See how he lets his breath pull more air to fill the bag with one breath instead of the 6 or 8 individual breaths, that is like how one exhaust "breath" from one cylinder pulls on the next one to better empty the cylinder and if you can get the cylinder more empty then you can pull in more A/F on the intake stroke and make more power. The pipes by them self would never make as much power if they were not able to pull their neighbors exhaust and by running duals you are limiting there ability to help there neighbor. I am not causing global warming, I am just trying to hold off a impending Ice Age!

Re: Dual 2.5" vs Single 3" exhaust [Re: HotRodDave] #1223236 04/29/12 01:54 PM 04/29/12 01:54 PM
Joined: Jul 2007 Posts: 271 MO, USA Tom Hand enthusiast
Tom Hand enthusiast Joined: Jul 2007 Posts: 271 MO, USA	For sure HotRod Dave you are right on about the tuning but in fact, at the muffler, heat loss gains power. Heat loss brings with it a loss of gas volume and that helps the muffler work a bit easier and this is what you want for good silencing. Obviously, we are both talking about different ends of the system and I agree about scavenging. Headers and good exhaust systems depend upon it to get fresh air in after getting exhausted air out. If any others want to see what new cars have on them to get good silencing and performance, check out new Honda and Toyotas. These have split pipes after the axle and run two very large volume mufflers. Exhaust is such cool science. Tom

Re: Dual 2.5" vs Single 3" exhaust [Re: DARTH V8Я] #1223237 04/29/12 02:27 PM 04/29/12 02:27 PM
Joined: Jan 2008 Posts: 3,886 Lost and Spaced B bboogieart master
bboogieart master B Joined: Jan 2008 Posts: 3,886 Lost and Spaced	Quote: The motor is about 331 cubic inches. The problem is that the spare tire well drops down in the trunk, and the gas tank occupies the space beside it. I could put dual 2.5's that exit in front of the rear fenderwells, with a couple 'bullet' style mufflers side by side. I know for sure a 3" pipe will route the like original exhaust did, and I can use a sideways mounted flowmaster 3" in/out muffler. Shooting for about 400hp @ the flywheel. I know with c-bodies the pipes are run over the axle and under the rear frame rails with no problems. Make sure they go past the bumper or your gonna hear em in the car. (droan) Unless that vega is realy low this should still work. As for the newer cars mentioned above, I always thought the split or "Y" pipe after the axle was just a marketing gimick because we like duals so much. Thats why we see them on pickups, no? I have mechanical Aptitude. I can screw up anything.

Re: Dual 2.5" vs Single 3" exhaust [Re: DARTH V8Я] #1223238 04/29/12 04:02 PM 04/29/12 04:02 PM
Joined: Jan 2008 Posts: 3,886 Lost and Spaced B bboogieart master
bboogieart master B Joined: Jan 2008 Posts: 3,886 Lost and Spaced	Quote: Car in question is a 73 Vega, (another quote)Think I'll just keep the original engine for now. (quote) Tee hee guess that's changed huh? I have mechanical Aptitude. I can screw up anything.

Re: Dual 2.5" vs Single 3" exhaust [Re: bboogieart] #1223239 04/29/12 07:55 PM 04/29/12 07:55 PM
Joined: Nov 2011 Posts: 2,154 Its a TRAP! DARTH V8Я OP Oh No!! I just had a moron attack!
DARTH V8Я OP Oh No!! I just had a moron attack! Joined: Nov 2011 Posts: 2,154 Its a TRAP!	HotRodDave, thanks for the detailed explanation.. awesome bboogieart, yup.. the plan has changed. I'm going with a 5.3L from a 2010 Chevy Silverado So theres no way to run a pipe down the drivers side, the spare tire well is in the way, and to even run 2" pipe both down the pass side, up over the axle to the rear bumper w/ 2 mufflers under the floor pan there is just no way without it looking like a total hack job. I think a single 3" is the way to go for my application. When it takes more than a sweet mullet to prove you rule at the trailer park..

Re: Dual 2.5" vs Single 3" exhaust [Re: DARTH V8Я] #1223240 05/01/12 11:58 AM 05/01/12 11:58 AM
Joined: May 2005 Posts: 416 Franklin Co. Illinois runinonmt mopar
runinonmt mopar Joined: May 2005 Posts: 416 Franklin Co. Illinois	Check into the Stealth Bomber articles in Mopar Muscle mid 2004. I planned to do the same on my Duster using an x-pipe instead of the Y so I could use an electric cutout on the extra exit but I gor a smokin' deal on a TTI exhaust. Dyno numbers were included. If you are interested I probably still have the mags. IIRC there was only .5" backpressure. Ron In sixty-five I was seventeen and running up one-o-one I don't know where I'm running now, I'm just running on Jackson Browne-Running On Empty

Re: Dual 2.5" vs Single 3" exhaust [Re: runinonmt] #1223241 05/01/12 09:55 PM 05/01/12 09:55 PM
Joined: Nov 2011 Posts: 2,154 Its a TRAP! DARTH V8Я OP Oh No!! I just had a moron attack!
DARTH V8Я OP Oh No!! I just had a moron attack! Joined: Nov 2011 Posts: 2,154 Its a TRAP!	I can't find that article... would you have a link? When it takes more than a sweet mullet to prove you rule at the trailer park..

Re: Dual 2.5" vs Single 3" exhaust [Re: DARTH V8Я] #1223242 05/02/12 12:32 PM 05/02/12 12:32 PM
Joined: Jan 2003 Posts: 16,123 Grand Haven, MI patrick I Live Here
patrick I Live Here Joined: Jan 2003 Posts: 16,123 Grand Haven, MI	another thing to think about. per unit length and gage of tubing, dual 2.5" will have 67% more material than single 3" while giving only 39% more cross sectional area. due to boundary layer effects with the greater surface area of the dual pipes, you won't see all 38% flow improvement, probably closer to 30%. so you'll be adding a fair amount of additional weight for not as much flow improvement. 1976 Spinnaker White Plymouth Duster, /6 A833OD 1986 Silver/Twilight Blue Chrysler 5th Ave HotRod SOLD!* 2011 Toxic Orange Dodge Charger R/T 2017 Grand Cherokee Overland 2014 Jeep Cherokee Latitude (holy crap, my daughter is driving)

Re: Dual 2.5" vs Single 3" exhaust [Re: DARTH V8Я] #1223243 05/02/12 12:44 PM 05/02/12 12:44 PM
Joined: Jan 2008 Posts: 4,254 Canada WO23Coronet master
WO23Coronet master Joined: Jan 2008 Posts: 4,254 Canada	Could you fit a 3.5" pipe in there? Your surface area of a 3.5" pipe is 9.621", while, as previously mentioned, the dual 2.5" is 9.817", so basically a wash as as far as that goes, but you have the advantages of a single pipe (less boundry layer, weight, etc). 3.5" pipe is a little tougher to find but not impossible.

Re: Dual 2.5" vs Single 3" exhaust [Re: patrick] #1223244 05/02/12 06:00 PM 05/02/12 06:00 PM
Joined: Jan 2003 Posts: 2,724 541 slobovia A990 master
A990 master Joined: Jan 2003 Posts: 2,724 541 slobovia	The single exhaust needs to be looked at harder, but its not something that would sell well, so the magazines wont talk about it Our 99 Dakota has a single exhaust, and it sounds like a dual x-pipe in the upper RPM range. Our local exhaust guy built it and told us 5 or 6 years ago the x-pipe thing was just a glorified single exhaust.

Re: Dual 2.5" vs Single 3" exhaust [Re: DARTH V8Я] #1223245 05/02/12 08:19 PM 05/02/12 08:19 PM
Joined: May 2005 Posts: 416 Franklin Co. Illinois runinonmt mopar
runinonmt mopar Joined: May 2005 Posts: 416 Franklin Co. Illinois	Quote: I can't find that article... would you have a link? Yeah, I couldn't find one either. I finally found the mag."flows as well as a 2.5 inch system and looks stock..sorta'" See attatched. Mopar Muscle Sept '04 Ron 7189808-MM04_09PassinGas001.jpg (256 downloads) Last edited by runinonmt; 05/02/12 08:22 PM.

Re: Dual 2.5" vs Single 3" exhaust [Re: runinonmt] #1223246 05/02/12 08:24 PM 05/02/12 08:24 PM
Joined: May 2005 Posts: 416 Franklin Co. Illinois runinonmt mopar
runinonmt mopar Joined: May 2005 Posts: 416 Franklin Co. Illinois	#2 7189815-MM04_09PassinGas002.jpg (279 downloads) In sixty-five I was seventeen and running up one-o-one I don't know where I'm running now, I'm just running on Jackson Browne-Running On Empty

Re: Dual 2.5" vs Single 3" exhaust [Re: runinonmt] #1223247 05/02/12 08:26 PM 05/02/12 08:26 PM
Joined: May 2005 Posts: 416 Franklin Co. Illinois runinonmt mopar
runinonmt mopar Joined: May 2005 Posts: 416 Franklin Co. Illinois	#3 7189818-MM04_09PassinGas003.jpg (237 downloads) In sixty-five I was seventeen and running up one-o-one I don't know where I'm running now, I'm just running on Jackson Browne-Running On Empty

Re: Dual 2.5" vs Single 3" exhaust [Re: runinonmt] #1223248 05/02/12 08:27 PM 05/02/12 08:27 PM
Joined: May 2005 Posts: 416 Franklin Co. Illinois runinonmt mopar
runinonmt mopar Joined: May 2005 Posts: 416 Franklin Co. Illinois	#4 7189819-MM04_09PassinGas004.jpg (262 downloads) In sixty-five I was seventeen and running up one-o-one I don't know where I'm running now, I'm just running on Jackson Browne-Running On Empty

Re: Dual 2.5" vs Single 3" exhaust [Re: runinonmt] #1223249 05/02/12 08:29 PM 05/02/12 08:29 PM
Joined: May 2005 Posts: 416 Franklin Co. Illinois runinonmt mopar
runinonmt mopar Joined: May 2005 Posts: 416 Franklin Co. Illinois	#5 7189821-MM04_09PassinGas005.jpg (260 downloads) In sixty-five I was seventeen and running up one-o-one I don't know where I'm running now, I'm just running on Jackson Browne-Running On Empty

Re: Dual 2.5" vs Single 3" exhaust [Re: runinonmt] #1223250 05/02/12 08:31 PM 05/02/12 08:31 PM
Joined: May 2005 Posts: 416 Franklin Co. Illinois runinonmt mopar
runinonmt mopar Joined: May 2005 Posts: 416 Franklin Co. Illinois	#6 7189823-MM04_09PassinGas006.jpg (285 downloads) In sixty-five I was seventeen and running up one-o-one I don't know where I'm running now, I'm just running on Jackson Browne-Running On Empty

Re: Dual 2.5" vs Single 3" exhaust [Re: DARTH V8Я] #1223251 05/02/12 08:44 PM 05/02/12 08:44 PM
Joined: Dec 2010 Posts: 12,375 SoCal MuuMuu101 I got lucky at Woodward!
MuuMuu101 I got lucky at Woodward! Joined: Dec 2010 Posts: 12,375 SoCal	Quote: HotRodDave, thanks for the detailed explanation.. awesome bboogieart, yup.. the plan has changed. I'm going with a 5.3L from a 2010 Chevy Silverado So theres no way to run a pipe down the drivers side, the spare tire well is in the way, and to even run 2" pipe both down the pass side, up over the axle to the rear bumper w/ 2 mufflers under the floor pan there is just no way without it looking like a total hack job. I think a single 3" is the way to go for my application. Simple fix... Why don't you run open headers through the hood?

Re: Dual 2.5" vs Single 3" exhaust [Re: runinonmt] #1223252 05/02/12 10:11 PM 05/02/12 10:11 PM
Joined: Nov 2011 Posts: 2,154 Its a TRAP! DARTH V8Я OP Oh No!! I just had a moron attack!
DARTH V8Я OP Oh No!! I just had a moron attack! Joined: Nov 2011 Posts: 2,154 Its a TRAP!	runinonmt, many many thanks my friend! I'm going to a semi supply store to buy a 3.5" elbow.. IF that fits over the axle, I'm good to go. Also I agree that the single exhaust for performance apps has to be looked into more. When it takes more than a sweet mullet to prove you rule at the trailer park..

Re: Dual 2.5" vs Single 3" exhaust [Re: DARTH V8Я] #1223253 05/03/12 07:43 AM 05/03/12 07:43 AM
Joined: Oct 2003 Posts: 21,345 Marysville, O-H-I-O 70Cuda383 Too Many Posts
70Cuda383 Too Many Posts Joined: Oct 2003 Posts: 21,345 Marysville, O-H-I-O	single exhaust can sound good! http://youtu.be/u4YXAdjfO6o Photobucket sucks

Re: Dual 2.5" vs Single 3" exhaust [Re: DARTH V8Я] #1223254 05/03/12 08:58 AM 05/03/12 08:58 AM
Joined: May 2005 Posts: 416 Franklin Co. Illinois runinonmt mopar
runinonmt mopar Joined: May 2005 Posts: 416 Franklin Co. Illinois	Quote: runinonmt, many many thanks my friend! I'm going to a semi supply store to buy a 3.5" elbow.. IF that fits over the axle, I'm good to go. Also I agree that the single exhaust for performance apps has to be looked into more. Glad I could help. Nice to get some use from the old mags. I had a single cat-back Flowmaster on the R/T Dakota I used to have. Worked and sounded good. Ron In sixty-five I was seventeen and running up one-o-one I don't know where I'm running now, I'm just running on Jackson Browne-Running On Empty

Re: Dual 2.5" vs Single 3" exhaust [Re: DARTH V8Я] #1223255 05/03/12 10:59 AM 05/03/12 10:59 AM
Joined: Nov 2011 Posts: 2,154 Its a TRAP! DARTH V8Я OP Oh No!! I just had a moron attack!
DARTH V8Я OP Oh No!! I just had a moron attack! Joined: Nov 2011 Posts: 2,154 Its a TRAP!	Yeah a single exhaust can sound every bit as good as a dual imo. I was talking with a guy last night who owns a 1986 Iroc (350cid). He was telling me that originally he had dual 2" exhaust w/ cherry bomb mufflers on it for a few years. He then went a built a single 3.5" for it ( 3.5 y-pipe, 3.5 main pipe, flowmaster 40 series muffler 3.5 in/out) and told me that the car went 6/10ths faster in the quarter mile (from 13.60 to 13.00)! I had no idea a dual 2" with cherry bombs were THAT restrictive! When it takes more than a sweet mullet to prove you rule at the trailer park..

Re: Dual 2.5" vs Single 3" exhaust [Re: DARTH V8Я] #1223256 05/03/12 01:13 PM 05/03/12 01:13 PM
Joined: Jan 2003 Posts: 16,123 Grand Haven, MI patrick I Live Here
patrick I Live Here Joined: Jan 2003 Posts: 16,123 Grand Haven, MI	I patterned the system on my 5th avenue similar to the stealth bomber. I used "cheapie" summit 1 5/8" headers, to 3" 409 stainless collectors, then mandrel bent 409 stainless to a stainless magnaflow dual 3" in/3" out Y, a 3" stainless flex coupler to a dynomax 16669 3"in/out/internal "large body hemi" turbo muffler (10x5x22" case), 3" 409 mandrel bent over the axle, a 3" glass pack in the tailpipe (really helped with interior resonance/drone) to a gibson 3" turn down tip. sounded very nice...here's a clip I put on youtube before I sold it http://www.youtube.com/watch?v=QvZ2lqPzogQ 1976 Spinnaker White Plymouth Duster, /6 A833OD 1986 Silver/Twilight Blue Chrysler 5th Ave HotRod SOLD!* 2011 Toxic Orange Dodge Charger R/T 2017 Grand Cherokee Overland 2014 Jeep Cherokee Latitude (holy crap, my daughter is driving)

Re: Dual 2.5" vs Single 3" exhaust [Re: patrick] #1223257 05/03/12 10:12 PM 05/03/12 10:12 PM
Joined: Nov 2011 Posts: 2,154 Its a TRAP! DARTH V8Я OP Oh No!! I just had a moron attack!
DARTH V8Я OP Oh No!! I just had a moron attack! Joined: Nov 2011 Posts: 2,154 Its a TRAP!	Awesome soound there buddy My 3.5" elbow is on backorder, time to figure out the rest 7191442-vega%20motor%20install%20016.JPG (297 downloads) When it takes more than a sweet mullet to prove you rule at the trailer park..

Re: Dual 2.5" vs Single 3" exhaust [Re: DARTH V8Я] #1223258 05/03/12 10:18 PM 05/03/12 10:18 PM
Joined: Jan 2003 Posts: 104,346 Garden Grove, CA OzHemi Penguin-hating Ginger
OzHemi Penguin-hating Ginger Joined: Jan 2003 Posts: 104,346 Garden Grove, CA	Pssst....you know, if you want to run AN fittings on your heater hoses, you can pull out the factory stainless bungs (they are only pressed in) and tap the holes out to NPT. (they are 2 different sized holes)

Re: Dual 2.5" vs Single 3" exhaust [Re: OzHemi] #1223259 05/03/12 11:27 PM 05/03/12 11:27 PM
Joined: Nov 2011 Posts: 2,154 Its a TRAP! DARTH V8Я OP Oh No!! I just had a moron attack!
DARTH V8Я OP Oh No!! I just had a moron attack! Joined: Nov 2011 Posts: 2,154 Its a TRAP!	Thanks for the tip, what do you do on the core side? When it takes more than a sweet mullet to prove you rule at the trailer park..

Re: Dual 2.5" vs Single 3" exhaust [Re: DARTH V8Я] #1223260 05/03/12 11:32 PM 05/03/12 11:32 PM
Joined: Jan 2003 Posts: 104,346 Garden Grove, CA OzHemi Penguin-hating Ginger
OzHemi Penguin-hating Ginger Joined: Jan 2003 Posts: 104,346 Garden Grove, CA	I ran AN hose from the water pump to the firewall, then an AN bulkhead fitting, and then used AN pushlock style fittings under the dash side to heater hose to run to the aftermarket a/c-heater box.

Re: Dual 2.5" vs Single 3" exhaust [Re: OzHemi] #1223261 05/03/12 11:52 PM 05/03/12 11:52 PM
Joined: Nov 2011 Posts: 2,154 Its a TRAP! DARTH V8Я OP Oh No!! I just had a moron attack!
DARTH V8Я OP Oh No!! I just had a moron attack! Joined: Nov 2011 Posts: 2,154 Its a TRAP!	WOW! Thats a clean install! I was just gonna flip the core 180 degrees and use the rubber hoses. BUT I'm digging your setup. When it takes more than a sweet mullet to prove you rule at the trailer park..

Re: Dual 2.5" vs Single 3" exhaust [Re: DARTH V8Я] #1223262 05/03/12 11:57 PM 05/03/12 11:57 PM
Joined: Jan 2003 Posts: 104,346 Garden Grove, CA OzHemi Penguin-hating Ginger
OzHemi Penguin-hating Ginger Joined: Jan 2003 Posts: 104,346 Garden Grove, CA	Thanks I took my time and tried to make it pretty tidy at least. I ran the heater hoses under the intake...not really something you can do with the factory F body intake of course. I ran them up under the A/C compressor then through the bracket. You can kinda see in this pic 7191614-003(54).JPG (105 downloads)

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