Originally Posted by Stavros
Originally Posted by Mike Rainbird
I think the exhaust needs looking at as well! Measure the back pressure, I bet it's the same as the boost pressure
.
But backpressure can be 3times boost pressure and still be making good power.
Its not an ideal situation, but be suprised if a 2.5in is holding him back THAT much.
How far away from 400bhp are you now?
315bhp! it made 336bhp with higher C/r on the same exhaust,head,turbo etc etc