3" vs 4" downpipe
#1
3" vs 4" downpipe
At what point do you need to run a 4 inch down pipe? Lets say the setup is a custom top mount set up, 2 liter b series. Looking for 500 on pump, and 600-650 on race gas. Is the 4 inch only necessary when your looking for like 800-900hp?
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#7
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Re: 3" vs 4" downpipe
I'm making over 500 on pump gas on a similar setup with a 3 inch.I would say its only wrth moving up to a 4 inch if the whole exhaust is 4 inch to make use of it and as long as the rest of the setup is capable of making the most power from the 4 inch downpipe.
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#8
Re: 3" vs 4" downpipe
I personally am making over 600whp here on 3" without any issues, one of my close friends makes a fuzz over 850awhp on his 2.0 liter 6765 evo with 3".
My 2 cents, 3" should be fine in your application. However if you can fit 4" and its not a bunch of added cost, go 4"... you probably would see a small advantage in peak power over 3".
My 2 cents, 3" should be fine in your application. However if you can fit 4" and its not a bunch of added cost, go 4"... you probably would see a small advantage in peak power over 3".
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