lol give him a break, this is after all a forum and not just a giant search engine.. what are we gunna do when evry topic has been covered? disable posting and just have the search button there?
i think he's going by the no back pressure rule...
its not all about pipe size for back pressure tho, mufflers play a massive part in this! example, you put on a 3" exhaust, but need four mufflers (same as jtunes) to keep it quiet... where as hks uses 2.5inch pipes and only three mufflers... that one less muffler addding back pressure, so they prob both have the same flow capabilities...
I don't think you gonna get much power difference from 2.5 inch and 3 inch comparison if you just add I/H/E mods. 3 inch exhaust, probably gonna be much difference if you combine with cams combo and higher flow intake manifold.
Originally Posted by kazam
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