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Re: Preference - 2.5" exhaust or 3.0" on a stock 383 auto?
[Re: can.al]
#1100356
10/25/11 07:26 PM
10/25/11 07:26 PM
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Joined: Jan 2008
Posts: 669
Michigan, USA
ramman5600
OP
mopar
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OP
mopar
Joined: Jan 2008
Posts: 669
Michigan, USA
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Quote:
..i agree, 2 1/4 is plenty.
..i'm not convinced mandrel bends are an improvement.
..i ve read tests that show only 12 or 15 hp increase with open headers on a 300 hp build.
300 Hp is relatively mild and 2 1/4 is probably adequate (I think that is stock size for a 383). I think you should continue your research on the value of mandrel bending as well as the combination of horsepower and torque with different exhausts. Also 15 hp is 5% of 300hp.
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Re: Preference - 2.5" exhaust or 3.0" on a stock 383 auto?
[Re: SomeCarGuy]
#1100360
10/28/11 06:27 AM
10/28/11 06:27 AM
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Joined: Jan 2005
Posts: 4,862
the frozen wastes...
Pale_Roader
Swears too much
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Swears too much
Joined: Jan 2005
Posts: 4,862
the frozen wastes...
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Quote:
You must live in a real backwoods place if you can't find a guy w/ a mandrel bender. We even have them here in the middle of nowhere. I did specify it had to be a gearhead place, maybe you missed that.
Those TTI systems are pretty spendy, especially compared to what I get done.
You're definitely from 'someplace i'm not' then... Last i checked there was ONE mandrel bender in the entire region... including a city over 2 million people. Maybe another one has popped up since, but common they are not. And last i checked that one place was so busy building their own systems to sell they weren't interested in one-offs.
The local guy CAN cut and paste a mandrel system... I've made a few already, but that (supposedly) '$100000 machine' is a luxury we dont have. Even finding someone that can cut and paste a mandrel out ov pipe/U-bend kits is gonna be hard. From what i've seen this SIMPLE operation is utterly beyond the capacity ov most 'local guys'. The crap i have seen under cars...
Also, the last time i had a 'custom' 'HP' exhaust built by a shop (press bends) it cost me over $500 (the going rate here 15 years ago). It was the best place in town, and it was utter crap. The shop i would have preferred to go to "wont touch a Mopar" because they are impossible to do. He also said it is literally impossible to get a 3" pipe over a Mopar's axle, and if forced, will only do a 2 1/4" system. Most exhaust shops are stuck in the 70's, and will build 'HP' systems yet still assume you'll be uncorking it at the track...
2 1/4" is enough pipe for a 273 2bbl. Even the Mustang GT's in 96 went up to 2 1/2" for their 215HP 4.6L. Thats 281cid people. Why? Because it was more efficient and made more power. Even 1/4" extra pipe on a high-production car like a Mustang is gonna cost them a fortune... they wouldn't do it unless there was a good reason.
You can get good full-system mandrel 2 1/2" or 3" deals from many different manufacturers... there is NO reason to shop local. As far as i'm concerned, the local shops have made their own beds. Many ov them shouldn't even be allowed to install the pre-made systems.
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Re: Preference - 2.5" exhaust or 3.0" on a stock 383 auto?
[Re: Pale_Roader]
#1100364
10/28/11 08:32 AM
10/28/11 08:32 AM
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Joined: Jan 2003
Posts: 16,123
Grand Haven, MI
patrick
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 16,123
Grand Haven, MI
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Quote:
2 1/4" is enough pipe for a 273 2bbl. Even the Mustang GT's in 96 went up to 2 1/2" for their 215HP 4.6L. Thats 281cid people. Why? Because it was more efficient and made more power. Even 1/4" extra pipe on a high-production car like a Mustang is gonna cost them a fortune... they wouldn't do it unless there was a good reason.
heck, out '06 dodge grand caravan with a 3.8L has a mandrel bent 2.5" single exhaust....
which, as an aside, if you can/know someone who can weld stainless, one good option for piecing together your own mandrel exhaust is to go to junkyards and pick up a couple exhaust systems from late model wrecks. basically all the chrysler products use 409 stainless, the LH's and caravans are 2.5" mandrel bent, the hemi trucks are 3" mandrel bent.
the 3" big single on my car is 409 stainless, built out of a magnaflow Y, and 3" 409 from take-off tail pipes from '98 up rams (they're 2.5" to the end of the muffler, and flare up to 3" for the tail pipe)...luckily I have a friend who at the time had access to a lift and is good at TIG welding...
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)
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Re: Preference - 2.5" exhaust or 3.0" on a stock 383 auto?
[Re: SomeCarGuy]
#1100365
10/28/11 09:17 AM
10/28/11 09:17 AM
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Joined: Jan 2003
Posts: 75,326
A gulag near you.
JohnRR
I Win
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I Win
Joined: Jan 2003
Posts: 75,326
A gulag near you.
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Quote:
You must live in a real backwoods place if you can't find a guy w/ a mandrel bender. We even have them here in the middle of nowhere. I did specify it had to be a gearhead place, maybe you missed that.
Those TTI systems are pretty spendy, especially compared to what I get done.
Where do you live that there is a shop with a mandrel bender on every other corner?
I live just north of BOSTON , there is only one place I know of in a 100 mile radius and he isn't cheap. I had some exhaust work done there and it would have been cheaper to get a TTi system, except TTi doesn't make headpipes for my car, big block A body with factory exh. manifolds, and their tailpipes are not made correctly for FACTORY location, found that out after I had them installed and had to be cut and modified to fit factory muffler and rear tip location.
Nevermind mandrel benders are VERY expensive , which is why mandrel bent systems are pricy, though TTi thinks they have the market cornered and charges like they are the only game in town.
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Re: Preference - 2.5" exhaust or 3.0" on a stock 383 auto?
[Re: JohnRR]
#1100366
10/28/11 09:27 AM
10/28/11 09:27 AM
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Joined: Nov 2005
Posts: 15,126
85086
moparpollack
Lil Herman
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Lil Herman
Joined: Nov 2005
Posts: 15,126
85086
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Quote:
Quote:
You must live in a real backwoods place if you can't find a guy w/ a mandrel bender. We even have them here in the middle of nowhere. I did specify it had to be a gearhead place, maybe you missed that.
Those TTI systems are pretty spendy, especially compared to what I get done.
Where do you live that there is a shop with a mandrel bender on every other corner?
I live just north of BOSTON , there is only one place I know of in a 100 mile radius and he isn't cheap. I had some exhaust work done there and it would have been cheaper to get a TTi system, except TTi doesn't make headpipes for my car, big block A body with factory exh. manifolds, and their tailpipes are not made correctly for FACTORY location, found that out after I had them installed and had to be cut and modified to fit factory muffler and rear tip location.
Nevermind mandrel benders are VERY expensive , which is why mandrel bent systems are pricy, though TTi thinks they have the market cornered and charges like they are the only game in town.
There was a company out of Canada that was selling mandrel bent header back exhaust systems for mopars. He was selling them on ebay for like $250 plus shipping.
56 Plaza 63 D100 step side 67 Coronet, 68 Roadrunner, 69 Super Bees, 69 Coronet 500 convertible, 70 Roadrunner Post, 79 D150 360, and a severe case of Mopar a,d,d
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Re: Preference - 2.5" exhaust or 3.0" on a stock 383 auto?
[Re: moparpollack]
#1100367
10/28/11 09:29 AM
10/28/11 09:29 AM
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Joined: Jan 2003
Posts: 75,326
A gulag near you.
JohnRR
I Win
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I Win
Joined: Jan 2003
Posts: 75,326
A gulag near you.
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Quote:
Quote:
Quote:
You must live in a real backwoods place if you can't find a guy w/ a mandrel bender. We even have them here in the middle of nowhere. I did specify it had to be a gearhead place, maybe you missed that.
Those TTI systems are pretty spendy, especially compared to what I get done.
Where do you live that there is a shop with a mandrel bender on every other corner?
I live just north of BOSTON , there is only one place I know of in a 100 mile radius and he isn't cheap. I had some exhaust work done there and it would have been cheaper to get a TTi system, except TTi doesn't make headpipes for my car, big block A body with factory exh. manifolds, and their tailpipes are not made correctly for FACTORY location, found that out after I had them installed and had to be cut and modified to fit factory muffler and rear tip location.
Nevermind mandrel benders are VERY expensive , which is why mandrel bent systems are pricy, though TTi thinks they have the market cornered and charges like they are the only game in town.
There was a company out of Canada that was selling mandrel bent header back exhaust systems for mopars. He was selling them on ebay for like $250 plus shipping.
Just because the company was in canada doesn't mean that is where those parts came from ....
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Re: Preference - 2.5" exhaust or 3.0" on a stock 383 auto?
[Re: JohnRR]
#1100368
10/28/11 09:32 AM
10/28/11 09:32 AM
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Joined: Nov 2005
Posts: 15,126
85086
moparpollack
Lil Herman
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Lil Herman
Joined: Nov 2005
Posts: 15,126
85086
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Quote:
Quote:
Quote:
Quote:
You must live in a real backwoods place if you can't find a guy w/ a mandrel bender. We even have them here in the middle of nowhere. I did specify it had to be a gearhead place, maybe you missed that.
Those TTI systems are pretty spendy, especially compared to what I get done.
Where do you live that there is a shop with a mandrel bender on every other corner?
I live just north of BOSTON , there is only one place I know of in a 100 mile radius and he isn't cheap. I had some exhaust work done there and it would have been cheaper to get a TTi system, except TTi doesn't make headpipes for my car, big block A body with factory exh. manifolds, and their tailpipes are not made correctly for FACTORY location, found that out after I had them installed and had to be cut and modified to fit factory muffler and rear tip location.
Nevermind mandrel benders are VERY expensive , which is why mandrel bent systems are pricy, though TTi thinks they have the market cornered and charges like they are the only game in town.
There was a company out of Canada that was selling mandrel bent header back exhaust systems for mopars. He was selling them on ebay for like $250 plus shipping.
Just because the company was in canada doesn't mean that is where those parts came from ....
John I had heart burn buying them from a foreign country too. But the guy had a muffler shop and was bending kit himself. Let me do more research if the bandwith will let me. 
56 Plaza 63 D100 step side 67 Coronet, 68 Roadrunner, 69 Super Bees, 69 Coronet 500 convertible, 70 Roadrunner Post, 79 D150 360, and a severe case of Mopar a,d,d
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Re: Preference - 2.5" exhaust or 3.0" on a stock 383 auto?
[Re: dangina]
#1100370
10/28/11 03:05 PM
10/28/11 03:05 PM
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Joined: Nov 2007
Posts: 21,928
Kirkland, Washington
Pacnorthcuda
Too Many Posts
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Too Many Posts
Joined: Nov 2007
Posts: 21,928
Kirkland, Washington
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Quote:
would you still recommend a 2,5" exhaust it you change the carb, intake, aftermarket cam and headers? or would u step up to a 3"?
I wouldn't. My car had factory manifolds and a 3" system when i bought it, 70 440 'Cuda. Louder than hell, massive drone.
Yarded the system and sold it. Installed headers and a custom 2.5" system. Not mandrel bent but nice (a good pipe bender knows how to bend pipe without overly necking it down.).
Very nice sound now, more power and no drone.
IMO 3" systems are far more likely to drone than 2.5"
And I'll go to a GOOD exhaust shop any day. All cars are different, I want my systems "high, tight, and even" It takes a good exhaust man to do that on MY car! Not a system meant for every other 440 Cuda out there. Thats my 4 cents.
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Re: Preference - 2.5" exhaust or 3.0" on a stock 383 auto?
[Re: dangina]
#1100371
10/28/11 04:02 PM
10/28/11 04:02 PM
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Joined: Apr 2005
Posts: 15,134
Kelowna, B.C. Canada
DPelletier
I Live Here
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I Live Here
Joined: Apr 2005
Posts: 15,134
Kelowna, B.C. Canada
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Quote:
would you still recommend a 2,5" exhaust it you change the carb, intake, aftermarket cam and headers? or would u step up to a 3"?
Not necessary; again - unless you're planning on over 500hp there is no need for a 3" system. A quality 2 1/2" is more than adequate for anything you plan on doing.
Dave
1970 Super Bee 440 Six Pack
1974 'Cuda
2008 Ram 3500 Diesel
2006 Ram 3500 Diesel
2004.5 Ram 2500 Diesel
2003 Ram 3500 Diesel
2006 Durango Limited
[url] http://1970superbee.piczo.com [/url]
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Re: Preference - 2.5" exhaust or 3.0" on a stock 383 auto?
[Re: domingo]
#1100373
10/29/11 01:58 AM
10/29/11 01:58 AM
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Joined: Jan 2003
Posts: 2,679
Maple Ridge, BC, Canada
Barnabas_Kriss
master
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master
Joined: Jan 2003
Posts: 2,679
Maple Ridge, BC, Canada
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2.5" should be plenty. Most of the cars with 3" system that I have seen personally sounded horrible. Too loud and annoying sound.
I am lucky to have a local shop that does ONLY performance work and does mandrel bending. I had a 2.5" all stainless steel system built by them. Very nice work, super thick flanges, uses all factory hangers, TIG welded, muffles and resonators in factory location, and removable X-pipe with V-clamps (so clutch/transmission can be easily removed). He was done with it in a few days. The only drawback was the cost (~$2000).
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Must be the X-Pipe 
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