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Message: <blockquote data-quote="LCP" data-source="post: 208876" data-attributes="member: 2424">Whoa, how can I miss this thread... <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite8" alt=":D" title="Big Grin    :D" loading="lazy" data-shortname=":D" /> 8080, in my opinion, stock 325i sucks at low rev, city driveability at low revs is just plain sedated (just like me today, out sick on MC)... Anyway, as the revs get higher and higher, the pull gets stronger and stronger, and it will continue pulling even past 6000rpm, after that I dare not try already, balls not big enough. I guess the way they designed the manifold is very important, it must not only be able to flow large amount of air without restriction (M50B25 manifold), but at light throttle (read: small amount of air), it should be able to give the responsiveness for better driveability (M50B20/M52B28 manifold)... having said that, there are some car manufacturers with manifold design can actually varies the path length of the air intake depending on the amount of air flowing through, not too different from the M52B28 muffler concept... You should go for the M50B25 intake manifold, but if possible, get a feel first from a car with such mods... The hit at low revs will be there but since the engine is bigger (no replacement for displacement, as they say), it may be liveable. Also if you wanna do US M3 cams, the hit at low revs will even be more as the cam profile is designed for higher revving engine...</blockquote>

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