4" down pipe?
#1
05-19-2018, 04:15 PM
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
#2
05-19-2018, 10:11 PM
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.
#3
05-19-2018, 11:51 PM
#5
05-20-2018, 07:43 AM
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.
#6
05-20-2018, 07:49 AM
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.
#7
05-20-2018, 07:50 AM
Fleet Mechanic
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
#8
05-20-2018, 07:57 AM
#10
05-20-2018, 08:03 AM
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.
#11
05-20-2018, 08:07 AM
Fleet Mechanic
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.
#12
05-20-2018, 08:12 AM
#13
05-20-2018, 08:13 AM
#14
05-20-2018, 08:20 AM
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.
#15
05-20-2018, 09:25 AM
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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.