Straight pipe?
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Junior User
Joined: Mar 2004
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Straight pipe?
Hey guys, I bought my 01 f350 used, and the dealer had the local exhaust shop put on a generic 3" muffler on. My guess is it had a straight pipe on it, in MO. you need a muffler to pass state inspection. I cant afford the exhaust i want right now, Would i notice a difference if i had the muffler cut out and a straight put in? The rest of the exhaust is stock. Thanks guys.
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Joined: Jan 2003
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From: usa
a 3 inch or 3 1/2? What kind of Muffler? Does the pipe go in and out in the same positon or does one go in Low and one come out High? If its the same then its a straight through Muffler and you wont see much if any gain by taking it off. If its an Offset In/Out then you should gain taking it off.
Post Fiend
Joined: Aug 2002
Posts: 5,324
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From: Denton,TX
I agree with BigBully. Do you really need a muffler in a diesel to pass the state inspection? There are usually different rules for diesels and the turbo actually acts as a muffler. Regardless, you can get a performance muffler for your system that would help out. Stock system is 3.5" on your truck I believe. You will see some gain by removing the muffler, especially if it's a generic offset not designed for your application.
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I'm a mo state inspector so either way it will pass now. But in mo it has to have a
muffler, however it doesnt have to pass any emissions sniff test. And yes it is a 3", i
measured it, none of the muffler shops in stlouis county handle anything over 3",
I know because i called around, gotta go a few miles away to get to where they can cut and bend bigger. The muffler is oval and offset like something from midas. And a very poor weld job to fill in the joints. Thats what has me so concerned, Thanks JD and BB. hossy,.
muffler, however it doesnt have to pass any emissions sniff test. And yes it is a 3", i
measured it, none of the muffler shops in stlouis county handle anything over 3",
I know because i called around, gotta go a few miles away to get to where they can cut and bend bigger. The muffler is oval and offset like something from midas. And a very poor weld job to fill in the joints. Thats what has me so concerned, Thanks JD and BB. hossy,.
Posting Guru
Joined: Feb 2004
Posts: 2,248
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From: Elverson, PA
Yea if it's 3" scrap that thing and get a straight through muffler made for a diesel. If you're gonna get a full exhaust later then just get something to work for now and save the cash for later!
Post Fiend
Joined: Aug 2002
Posts: 5,324
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From: Denton,TX
Originally Posted by FERacing66
can you get headers for a PSD?
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From: Cabot, Arkansas
Originally Posted by johnsdiesel
I read somewhere that some company is going to start selling them but you really don't need them. Not the same as a gas engine.
Purely speculation here, but I think the lack of aftermarket headers for the PSD would have more to do with packaging than anything else. There simply isn't very much room between the engine and the fenderwell, plus look at the angle of the exhaust manifolds......lots of custom bending to be done to fit headers. Maybe too much to make it cost effective to produce.
Then there's the up pipes...not much point in high zoot custom headers without matching custom sized up pipes. That would be akin to putting a 4" exhaust on with a stock muffler.
Of course I totally agree that a 4" turbo back system is more than enough to handle everything we can muster so far, I just think there is definately room for improvement on the other side of the turbo too.
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From: Cabot, Arkansas
Originally Posted by Hossy
I'm a mo state inspector so either way it will pass now. But in mo it has to have a
muffler, however it doesnt have to pass any emissions sniff test. And yes it is a 3", i
measured it, none of the muffler shops in stlouis county handle anything over 3",
I know because i called around, gotta go a few miles away to get to where they can cut and bend bigger. The muffler is oval and offset like something from midas. And a very poor weld job to fill in the joints. Thats what has me so concerned, Thanks JD and BB. hossy,.
muffler, however it doesnt have to pass any emissions sniff test. And yes it is a 3", i
measured it, none of the muffler shops in stlouis county handle anything over 3",
I know because i called around, gotta go a few miles away to get to where they can cut and bend bigger. The muffler is oval and offset like something from midas. And a very poor weld job to fill in the joints. Thats what has me so concerned, Thanks JD and BB. hossy,.
Junior User
Joined: Mar 2004
Posts: 89
Likes: 0
From: Northwest Houston
here's my observations: I had the stock exhaust on a 2000 7.3l 4x4 and we pulled the muffler and everything behind it off. The stock system once made into a straight pipe application was awesome. Saturday I removed stock totally and put in a 4" turbo back system with a straight through muffler. Turbo whine is almost gone, exhaust sounds like stock, and I could sware I seem to have lost some horsepower. I believe I am going to pull this muffler off and stay with a 4" straight pipe with a turndown now. My truck seemed to like the "no restriction at all" application better than the new system. By the way, does anyone know if it's legal or not to have a straight pipe in Texas on a diesel engine?
Last edited by majorpecs; Apr 12, 2004 at 10:43 AM.
Post Fiend
Joined: Aug 2002
Posts: 5,324
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From: Denton,TX
Originally Posted by cookie88
I would tend to disagree. I think in this instance it is exactly the same as a gas engine, just for a different reason. We put headers on our gasers to expel more exhaust at a faster rate. On a PSD that should translate into more boost sooner.
Purely speculation here, but I think the lack of aftermarket headers for the PSD would have more to do with packaging than anything else. There simply isn't very much room between the engine and the fenderwell, plus look at the angle of the exhaust manifolds......lots of custom bending to be done to fit headers. Maybe too much to make it cost effective to produce.
Then there's the up pipes...not much point in high zoot custom headers without matching custom sized up pipes. That would be akin to putting a 4" exhaust on with a stock muffler.
Of course I totally agree that a 4" turbo back system is more than enough to handle everything we can muster so far, I just think there is definately room for improvement on the other side of the turbo too.
Purely speculation here, but I think the lack of aftermarket headers for the PSD would have more to do with packaging than anything else. There simply isn't very much room between the engine and the fenderwell, plus look at the angle of the exhaust manifolds......lots of custom bending to be done to fit headers. Maybe too much to make it cost effective to produce.
Then there's the up pipes...not much point in high zoot custom headers without matching custom sized up pipes. That would be akin to putting a 4" exhaust on with a stock muffler.
Of course I totally agree that a 4" turbo back system is more than enough to handle everything we can muster so far, I just think there is definately room for improvement on the other side of the turbo too.
