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Message: <blockquote data-quote="Slide" data-source="post: 308849" data-attributes="member: 293">i've done the 325 conversion so has dinan328i. you gain bhp but loose torque.i ran my auto 328 (325 mani) against a manual 328 (stock mani) and i won.both or cars were about moded the same except for the manifold. after that race, the stock 328 manual did the manifold swap and on our 2nd drag, i could not keep up at all. big difference. there has been a lot of stuff writen on this here. but the most info you can get is on e36coupe.com. i bought mine off there, dan did his locally. can be done much cheaper here if your mech is good and knows what he's doing. only hitch is you can't use your 328 throttle body on the 325 manifold. and to get really good gains you need to do a remap, and not too many people here can do one for you. don't get a superchip as it's just a slightly modded map of a stock car that they download into your car and it's not based on YOUR car. but once you do the mani swap, you might want to look into getting the full nine yards from it, do the bigger throttle body, get rid of the stock air box, US M3 cams and do your exhaust as well. and after you do all this your auto box will blow. i'm on my 3rd rebuild. so you might want to consider a manual conversion. going this fast means you also need better brakes and suspension. do the math and you would have spent more on the mods then buying a proper m3.... and you still would not have the same power or those sexy throttle bodies.</blockquote>

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