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Message: <blockquote data-quote="torch318" data-source="post: 1321315" data-attributes="member: 20065"><p>I think it still goes back to the old saying that there is no replacement for displacement. If you look at a modded n/a 4.6 its resonable to expect 1hp per cubic inch or 281 hp. If you have a modded n/a 6.0 360 hp can also be expected.  If atmospheric air pressure is 14.7 lbs. and you add 8 lbs. Of boost in theory you should see a 50 percent increase in hp without considering things like pulled timing due to higher IAT's. In this setup a 4.6 should make 420 hp where as a 6.0 output jumps to 540hp. In a built motor setup staying with pump gas and going to 15 psi you should in theory see n/a power levels double or 560hp for the 4.6 and 720hp for the 6.0. In the end it still comes down to how much air a motor can process.</p></blockquote><p></p>