Quote:
Originally Posted by ar design
It has been proven a billion times over that no exhaust is the best exhaust on a turbo.
We just built 3" downpipes for the B5 Audi S4. Picked up over 30awhp with test pipes and over 20awhp with HFC secondaries over a set of gutted primary cat OEM downpipes. Going from HFCs to test pipes, we lost virtually no torque, and picked up around 10awhp. OEM downpipes are either 2.5 or 2.25in.
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I don't think you answered the question relative to the 335/135. What does your downpipe (a 3 inch tapering to 2.5) give more than a 2.5 all the way?
1hp, 5hp, 10hp, 100hp more?