Quote:
Originally Posted by Frank_Jaeger
I'm assuming you mean it bottlenecks after that point for peak power. But that's not the whole story. I noticed a huge improvement in turbo spool by going to a larger exhaust.
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I've done a fair amount of testing using a cut-out on the stock exhaust. There is something to be gained by reducing exhaust restriction, up to a point, when using a small t-25 style turbocharger. The optimal point was with the cut-out only partially open, around 20% of a 2.5" cutout.
A sweet blend of good exhaust velocity and overall flow capability is necessary.