4" downpipe question
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Senior User
Joined: Nov 2003
Posts: 200
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From: Lamar, SC
4" downpipe question
Wondering about the 4" downpipe. Is this a complete new exhaust from end to end, or just changing the downpipe to 4", and what noticable changes occur after modification? Thanks.
Postmaster
Joined: Feb 2002
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From: Bonney Lake, WA
A downpipe is the first section in the exhaust system, similar to a set of headers on a gasser. The benefit of a downpipe is reduced exhaust temps, and less restriction, so you'll be able to develop more power. As with a set of headers, the full benefit can't be felt without replacing the rest of the system with larger diameter tubing, preferably 4".
Smokin'
Joined: Nov 2003
Posts: 539
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From: Aston
what year truck do you have? a 4" dp will not fit a '94-'97 without major modding, but a 3"dp will. the 4" dp should fit in a 99+ with little or no manipulation of the firewall, then go 4" the rest of the way back 
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Senior User
Joined: Nov 2003
Posts: 200
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From: Lamar, SC
I have a 2000, considering upgrading exhaust. Just in the information gathering phase at this time, looking at getting some gauges, but figured getting it done all at once. When changing to 4", are most people leaving the muffler inline? I read a couple of posts where the went straight. I have 3 boys and we use the truck to go everywhere, and the wife will complain if the noise level gets too much higher, so what effect will changing have on that?
Smokin'
Joined: Nov 2003
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From: Aston
Originally posted by Jozey
94-97 psd can only fit a 3 inch down pipe,and thats a tight fit.
94-97 psd can only fit a 3 inch down pipe,and thats a tight fit.
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Junior User
Joined: May 2003
Posts: 90
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From: AZ
I've seen your downpipe 96,maybe mine is a 3.5 inch but it has almost no clearence from the firewall and the exhaust going behinde the motor.But its the best thing(exhaust)I ever bought for any of my vehicles with the biggest gain.
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