4" down pipe?
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More Turbo
Joined: Dec 2003
Posts: 571
Likes: 4
From: hondo
4" down pipe?
just in stalled a 4" down pipe. It is louder for sure. Also I seem to have some vibration some where. The bend behind the turbo is up against the fire wall. I don't think I can do anything about that? Just wanted to see if anyone had some advice or ideas about the vibration or anything else. Also there is a tranny pipe that runs right next to the down pipe. Do I need to try and move?
Thanks
Laughing Gas
Joined: Oct 2013
Posts: 817
Likes: 6
This won't really help you but might help others. The general consensus is to get a 3.5" downpipe for these trucks because of the issues you're having. Then a 4" exhaust from the downpipe back fits ok. But due to the issues you're having, a 4" downpipe isn't great. You'll have to decide if you want to change to a 3.5 or fix your issues.
Posting Guru
Joined: Mar 2014
Posts: 1,468
Likes: 5
From: Salt Lake City, utah
Loosen the clamp on the turbo and rotate the down pipe until you find the sweet spot then tighten the clamp. I have a 4” turbo back and haven’t had any clearance issues. It’s close to the uppipes but it will fit. What brand did you purchase? That could also be an issue.
Fleet Mechanic
Joined: May 2010
Posts: 1,480
Likes: 161
From: West by God Virginyuh
Which brand do you have? I’m interested in getting a 4” downpipe
Super Moderator
Joined: Jul 2004
Posts: 21,113
Likes: 3,939
From: Ohio
On the down side....
the 4 inch offers no benefit, the 3.5 helps with back pressure on the turbo which is necessary and performs better. Stock is 3 inch with a resonator for my 2003. If you want the 4 inch down to fit, you may have to hammer back the pinch welds on the cab to keep it from rubbing.
the 4 inch offers no benefit, the 3.5 helps with back pressure on the turbo which is necessary and performs better. Stock is 3 inch with a resonator for my 2003. If you want the 4 inch down to fit, you may have to hammer back the pinch welds on the cab to keep it from rubbing.
Hotshot
Joined: Dec 2003
Posts: 15,368
Likes: 121
From: Stuttgart, Ar
On the down side.... the 4 inch offers no benefit, the 3.5 helps with back pressure on the turbo which is necessary and performs better. Stock is 3 inch with a resonator for my 2003. If you want the 4 inch down to fit, you may have to hammer back the pinch welds on the cab to keep it from rubbing.
the 4 inch offers no benefit, the 3.5 helps with back pressure on the turbo which is necessary and performs better. Stock is 3 inch with a resonator for my 2003. If you want the 4 inch down to fit, you may have to hammer back the pinch welds on the cab to keep it from rubbing.
Fleet Mechanic
Joined: May 2010
Posts: 1,480
Likes: 161
From: West by God Virginyuh
On the down side.... the 4 inch offers no benefit, the 3.5 helps with back pressure on the turbo which is necessary and performs better. Stock is 3 inch with a resonator for my 2003. If you want the 4 inch down to fit, you may have to hammer back the pinch welds on the cab to keep it from rubbing.
the 4 inch offers no benefit, the 3.5 helps with back pressure on the turbo which is necessary and performs better. Stock is 3 inch with a resonator for my 2003. If you want the 4 inch down to fit, you may have to hammer back the pinch welds on the cab to keep it from rubbing.Trending Topics
Hotshot
Joined: Dec 2003
Posts: 15,368
Likes: 121
From: Stuttgart, Ar
Seriously, you're going there?
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Super Moderator
Joined: Jul 2004
Posts: 21,113
Likes: 3,939
From: Ohio
I wouldn't but it is your engine.
As an owner you can choose what to do. Introduced in the year of 2003 and the DYNO time I an others have spent since then, my advice is pretty solid but ultimately it is up to you to decide what is right. To clear a 4 inch down you will have to adjust, make room, and live with rubbing if not done correctly. if you are planning on compound turbo's and aiming at 1000+ HP then the 3.5 down may not apply.
I and other members only offer advice, the final out come is in your hands.
Fleet Mechanic
Joined: May 2010
Posts: 1,480
Likes: 161
From: West by God Virginyuh
I wouldn't but it is your engine.
As an owner you can choose what to do. Introduced in the year of 2003 and the DYNO time I an others have spent since then, my advice is pretty solid but ultimately it is up to you to decide what is right. To clear a 4 inch down you will have to adjust, make room, and live with rubbing if not done correctly. if you are planning on compound turbo's and aiming at 1000+ HP then the 3.5 down may not apply.
I and other members only offer advice, the final out come is in your hands.
As an owner you can choose what to do. Introduced in the year of 2003 and the DYNO time I an others have spent since then, my advice is pretty solid but ultimately it is up to you to decide what is right. To clear a 4 inch down you will have to adjust, make room, and live with rubbing if not done correctly. if you are planning on compound turbo's and aiming at 1000+ HP then the 3.5 down may not apply.
I and other members only offer advice, the final out come is in your hands.
Super Moderator
Joined: Jul 2004
Posts: 21,113
Likes: 3,939
From: Ohio
We did hours of testing, you have trade offs for each system. 4" is not wrong or right but to answer, the VGT performs better with back pressure.
Super Moderator
Joined: Jul 2004
Posts: 21,113
Likes: 3,939
From: Ohio
Every truck model year is just a tweak different on clearance, I would not recommend hammering the pipe into submission. Just massage the cab area where you find the pipe rubbing.
Elder User
Joined: Jan 2004
Posts: 900
Likes: 0
From: Arizona
Im not sure how back pressure would have any bearing on the VGT operation? I have had 4" AFE turbo back exhaust for many years now. My truck runs great. I pull a heavy Toyhauler without issue. I think the larger down-pipe is an excellent mod.
As stated earlier, just loosen the clamp and re-position. Also, keep the tranny lines from touching it.
As stated earlier, just loosen the clamp and re-position. Also, keep the tranny lines from touching it.