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Message: <blockquote data-quote="reivaxtorres" data-source="post: 503533" data-attributes="member: 8890">stock is like 9.5:1. with the pi swap, you are up to about 10.5:1. with ported PI heads, you are obviously going to be lower than that, but what it comes out to will depend on the end size of the combustion chamber on the head. yes, with the PI heads and a blower, you will need to run lower boost. but take this as an example...lets say at 9.5:1, you are making 100hp without the blower.at 10.5:1, you will be making lets say 110hp without the blower.lets say that at 9.5:1 with the blower @ 9lbs, you are making 160hpnow with the blower at 10.5:1 and at 6lbs, you are making 160hp. the higher compression, in either n/a or f/i setups, will always make more power than a similar setup with lower compression. you want my senario? i went from 218rwhp and 284rwtq with the NPI setup, and changing nothing but the PI heads, cams, and intake, i went to 265rwhp and 310rwtq, after a tune i went to 270rwhp and 313rwtq.</blockquote>