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Message: <blockquote data-quote="Slide" data-source="post: 461717" data-attributes="member: 293">changed the headers on my e36 328. and did a before and after dyno.changed them to original Hiop shortie headers.power increase, 1 rwbhp on my auto... maybe if you when and got longer ones like on the m3, you would get more of a gain.FC the same.sounds better to my ears. however if you do the complete intake, and exhaust with a custom remap,  the gains will be better. you shouldnt do it as just a stand a lone mod. the least i would do is a remap with it. and anybody who says you will gain bhp with just this one change is full of it and has not done it themselves.</blockquote>