Despite what some people think you feel a CAI alot more than just under WOT and it may not be equaling more HP or TQ but the ease of acceleration and climbing thru RPMs is alot better with one.. To be honest I probably didnt gain much of anything on paper but it performs, sounds and gets better mpg, now that I use the right gas. I got 15.3-15.5 going thru the hills on the way to and from Rausch