Quote:
Originally Posted by DiscountPirate
Ah, OK, so decreased air resistance and increased volume allows for lower pressure for efficiency?
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Yes. A larger filter with a larger cross section pipe will decrease restriction. I have seen this on the dyno even when the turbo inlet is as small as 2.5 inch, it makes more power with a smooth transition to a 4in pipe and filter. Very hard to do on a bottom mount.