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big exhaust systen on higher hp car??? #1565919 01/20/14 01:04 AM 01/20/14 01:04 AM
Joined: Mar 2005 Posts: 1,403 Chesterfield Twp. Mi. J John Burdine OP pro stock
John Burdine OP pro stock J Joined: Mar 2005 Posts: 1,403 Chesterfield Twp. Mi.	I'm going to build a 4" exhaust system for the Demon with a straight threw style race muffler and it will have tail pipes to the bumper. I'm going to use turbo clamps so I can remove it and slam bullet mufflers on the collectors for at the track. I would still like the exhaust system to flow as good as possible. my question is, is an x-pipe worth all the bends it takes to install one. I thought the school of thought was exhaust likes as few bends as possible. so, I'm need to decide to either run an x-pipe, or run the pipe straight to the muffler (maybe a balance tube) the out the tails.

Re: big exhaust systen on higher hp car??? [Re: John Burdine] #1565920 01/20/14 01:07 AM 01/20/14 01:07 AM
Joined: Jan 2003 Posts: 27,421 Balt. Md 3 383man Too Many Posts
383man Too Many Posts 3 Joined: Jan 2003 Posts: 27,421 Balt. Md	Do you plan to run tailpipes out to the rear bumper ? Never mind as I see where I missed that. Dont know how much room you have but are you planning to downsize the tailpipes to maybe 3" ? Ron Last edited by 383man; 01/20/14 01:08 AM.

Re: big exhaust systen on higher hp car??? [Re: John Burdine] #1565921 01/20/14 01:13 AM 01/20/14 01:13 AM
Joined: Jun 2003 Posts: 52,972 Romeo MI MR_P_BODY Master
MR_P_BODY Master Joined: Jun 2003 Posts: 52,972 Romeo MI	John... if you can get the muffs at the bumper it helps due to the exhaust being cooler back there... if you run a X pipe they do work BUT its suppose to be 1/2 way from the end of the primaries to the muffs or the expansion point(if no muffs are used)... A H-pipe you put at the end of the collectors(or close to the primaries)

Re: big exhaust systen on higher hp car??? [Re: MR_P_BODY] #1565922 01/20/14 01:19 AM 01/20/14 01:19 AM
Joined: Mar 2005 Posts: 1,403 Chesterfield Twp. Mi. J John Burdine OP pro stock
John Burdine OP pro stock J Joined: Mar 2005 Posts: 1,403 Chesterfield Twp. Mi.	is the x-pipe worth the extra bends?

Re: big exhaust systen on higher hp car??? [Re: John Burdine] #1565923 01/20/14 01:27 AM 01/20/14 01:27 AM
Joined: Jun 2003 Posts: 52,972 Romeo MI MR_P_BODY Master
MR_P_BODY Master Joined: Jun 2003 Posts: 52,972 Romeo MI	Quote: is the x-pipe worth the extra bends? Yes.. it does add HP to a system with muffs... if it has back pressure... so if you run a straight thru muff MAYBE you dont want the X.... its your choice based on back pressure... all it does is kick pulses back and forth

Re: big exhaust systen on higher hp car??? [Re: John Burdine] #1565924 01/20/14 01:28 AM 01/20/14 01:28 AM
Joined: Jan 2003 Posts: 19,355 Las Vegas Al_Alguire I Live Here
Al_Alguire I Live Here Joined: Jan 2003 Posts: 19,355 Las Vegas	IMO yes an X pipe is worth it. Will even quiet the car down a good deal. IF you have the room. "I am not ashamed to confess I am ignorant of what I do not know." "It's never wrong to do the right thing"

Re: big exhaust systen on higher hp car??? [Re: MR_P_BODY] #1565925 01/20/14 01:32 AM 01/20/14 01:32 AM
Joined: Jan 2007 Posts: 437 south central pa bdaz smblk mopar
bdaz smblk mopar Joined: Jan 2007 Posts: 437 south central pa	A friend of mine that runs a 7 sec true ten five n/a combo has a shop with a chassis dyno.He has tried everything and said on a car like yours a h pipe makes more power.Now on like a mustang or a car that runs 11 or 12's he said a x pipe has made more power.hope this helps. 3120lb, small block, 10.5" tire, NA, through exhaust, full int, WITH 83/4 REAR, 9.0 at 150mph

Re: big exhaust systen on higher hp car??? [Re: bdaz smblk] #1565926 01/20/14 01:38 AM 01/20/14 01:38 AM
Joined: Jun 2003 Posts: 52,972 Romeo MI MR_P_BODY Master
MR_P_BODY Master Joined: Jun 2003 Posts: 52,972 Romeo MI	Quote: A friend of mine that runs a 7 sec true ten five n/a combo has a shop with a chassis dyno.He has tried everything and said on a car like yours a h pipe makes more power.Now on like a mustang or a car that runs 11 or 12's he said a x pipe has made more power.hope this helps. I would say that his data was with some type of muffs (with the 11-12s car) which again is a back pressure thing... I like the H-pipe myself but it has to be up close to the engine(primaries) to be efficient

Re: big exhaust systen on higher hp car??? [Re: John Burdine] #1565927 01/20/14 03:23 AM 01/20/14 03:23 AM
Joined: May 2008 Posts: 5,399 Aurora, Colorado 451Mopar master
451Mopar master Joined: May 2008 Posts: 5,399 Aurora, Colorado	I think the X is a bit quieter than an H pipe system. Not sure how it is for power, but 4" is going to take a lot of room under the car. I had 3-1/2" on my car with straight through mufflers and it was way too loud for the street, but sounded good at the track.

Re: big exhaust systen on higher hp car??? [Re: 451Mopar] #1565928 01/20/14 06:54 AM 01/20/14 06:54 AM
Joined: Mar 2005 Posts: 1,403 Chesterfield Twp. Mi. J John Burdine OP pro stock
John Burdine OP pro stock J Joined: Mar 2005 Posts: 1,403 Chesterfield Twp. Mi.	I don't care if its quieter, just want what whichever will cost the least hp.

Re: big exhaust systen on higher hp car??? [Re: John Burdine] #1565929 01/20/14 09:49 AM 01/20/14 09:49 AM
Joined: Feb 2011 Posts: 4,302 Nebraska 72Swinger master
72Swinger master Joined: Feb 2011 Posts: 4,302 Nebraska	You have to pay close attention to how the x merge is made. If the two pipes are merged to close together it will defeat to purpose and cause a lot of restriction. Mopar to the bone!!!

Re: big exhaust systen on higher hp car??? [Re: 72Swinger] #1565930 01/20/14 01:17 PM 01/20/14 01:17 PM
Joined: Jan 2003 Posts: 9,870 Weddington, N.C. Streetwize master
Streetwize master Joined: Jan 2003 Posts: 9,870 Weddington, N.C.	Vizard did a recent article for Pop hot rodding where he said anything over 2.2cfm per horsepower doesn't gain you anything (but extra weight). Mainatining Velocity away from the exhaust valve and minimal downstram restrictions are at least AS important as OD. FAST guys are going high 9's with full dual 2 1/2" exhausts and Factory casting exhaust manifolds (obviously ported but still not as good as a race header)....that's pretty telling to me. WIZE World's Quickest Diahatsu Rocky (??) 414" Stroker Small block Mopar Powered. 10.84 @ 123...and gettin' quicker! https://www.youtube.com/watch?v=-mWzLma3YGI In Car: https://www.youtube.com/watch?v=PjXcf95e6v0

Re: big exhaust systen on higher hp car??? [Re: MR_P_BODY] #1565931 01/20/14 08:29 PM 01/20/14 08:29 PM
Joined: Jan 2007 Posts: 437 south central pa bdaz smblk mopar
bdaz smblk mopar Joined: Jan 2007 Posts: 437 south central pa	Quote: Quote: A friend of mine that runs a 7 sec true ten five n/a combo has a shop with a chassis dyno.He has tried everything and said on a car like yours a h pipe makes more power.Now on like a mustang or a car that runs 11 or 12's he said a x pipe has made more power.hope this helps. I would say that his data was with some type of muffs (with the 11-12s car) which again is a back pressure thing... I like the H-pipe myself but it has to be up close to the engine(primaries) to be efficient Both his test were with muffs.He has to run them in the class he runs. 3120lb, small block, 10.5" tire, NA, through exhaust, full int, WITH 83/4 REAR, 9.0 at 150mph

Re: big exhaust systen on higher hp car??? [Re: bdaz smblk] #1565932 01/21/14 08:50 AM 01/21/14 08:50 AM
Joined: Mar 2003 Posts: 1,629 pa 572charger top fuel
572charger top fuel Joined: Mar 2003 Posts: 1,629 pa	ive got 4 1/2 inch threw a set of top ten flowmasters and back to the bumper tail pipes no crossover or x pipe car runs the same with the 80 +lb exhaust on or off 9.60s at 140+ its not quiet but then again its hard to make 600cubes quiet !!! 606 hemi pump gas best 9.60 at 142mph on motor 05 hemi daytona 1500 go-mango 4wd quadcab 2007 hotrod mag pump gas drags runner up, roadkill nights dodge big tire winner 2018 2019 back to back

Re: big exhaust systen on higher hp car??? [Re: 572charger] #1565933 01/21/14 09:56 AM 01/21/14 09:56 AM
Joined: Jan 2003 Posts: 17,918 Akron, Ohio ProSport I Live Here
ProSport I Live Here Joined: Jan 2003 Posts: 17,918 Akron, Ohio	When I was running 9.80's with a 3.5" exhaust I added an x-pipe and it made the car sound really nice, and didn't slow it down one bit, system weighed about 75 pounds and the car ran a couple hundredths quicker and a tiny bit more mph than open headers. 1970 Challenger, all aluminum 528 Hemi, HDK suspension, Tremec 5 speed manual

Re: big exhaust systen on higher hp car??? [Re: ProSport] #1565934 01/22/14 01:52 AM 01/22/14 01:52 AM
Joined: Jul 2004 Posts: 1,145 Arizona, USA gsmopar super stock
gsmopar super stock Joined: Jul 2004 Posts: 1,145 Arizona, USA	I have the Pypes 3.5 X-pipe kit.

Re: big exhaust systen on higher hp car??? [Re: gsmopar] #1565935 01/22/14 09:06 AM 01/22/14 09:06 AM
Joined: Jan 2003 Posts: 6,389 nielsville, minn. Q quickd100 master
quickd100 master Q Joined: Jan 2003 Posts: 6,389 nielsville, minn.	I run a 3-1/2" system, X-pipe, 3-1/2" ultra-flows. I set it up like that when I built my 528 Hemi and it made more hp without the pipes on. By the time I built my 605 I had a dyno and tested the motor with and without the exhaust system in place. The 3-1//2" system cost 117hp and 97ftlbs on my 605. I can live with that though as hooking that much power on the street isn't going to happen anyway.Dave

Re: big exhaust systen on higher hp car??? [Re: quickd100] #1565936 01/22/14 09:54 AM 01/22/14 09:54 AM
Joined: Nov 2004 Posts: 354 K kielbasa enthusiast
kielbasa enthusiast K Joined: Nov 2004 Posts: 354	WOW, that seems like a HUGE loss!!!!!!!!!

Re: big exhaust systen on higher hp car??? [Re: kielbasa] #1565937 01/22/14 01:30 PM 01/22/14 01:30 PM
Joined: Jan 2003 Posts: 17,918 Akron, Ohio ProSport I Live Here
ProSport I Live Here Joined: Jan 2003 Posts: 17,918 Akron, Ohio	Big Hemi's are a different ball game, they sometimes don't like an exhaust system. Some guys make them work though, such as 572Charger. 1970 Challenger, all aluminum 528 Hemi, HDK suspension, Tremec 5 speed manual

Re: big exhaust systen on higher hp car??? [Re: ProSport] #1565938 01/22/14 01:46 PM 01/22/14 01:46 PM
Joined: Jan 2003 Posts: 13,351 Marion, South Carolina [><] an8sec70cuda I Live Here
an8sec70cuda I Live Here Joined: Jan 2003 Posts: 13,351 Marion, South Carolina [><]	Quote: Big Hemi's are a different ball game, they sometimes don't like an exhaust system. Some guys make them work though, such as 572Charger. Mine doesn't like mufflers. I still use my 4" H pipe system on the street, but at the track I put my short 4" bullets right on the collectors. CHIP '70 hemicuda, 575" Hemi, 727, Dana 60 '69 road runner, 440-6, 18 spline 4 speed, Dana 60 '71 Demon, 340, low gear 904, 8.75 '73 Chrysler New Yorker, 440, 727, 8.75 '90 Chevy 454SS Silverado, 476" BBC, TH400, 14 bolt '06 GMC 2500HD LBZ Duramax

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