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Message: <blockquote data-quote="Slide" data-source="post: 308955" data-attributes="member: 293">the best that i could find was the unichip guys. piggy back, not ideal but i have yet to find a guy here who can do a remap of the stock ecu. so unichip it was for me, they did pretty much all they said they would do and even got rid of a flat spot at 2500rpms for me. but having said that auto cars are hard to dyno, and the choices we have are not many. overall, i am happy with the unichip even with all the stuff they say about closed loop and open loop and not being able to fool the ecu... though choice. if u do, do the swap, you don't really need to do a remap. you might want to do it to get the max out of the manifold, but then you'll be on a slippery slide and one mod leads to the next and to the next etc. good luck dude. GB, not necessary to get an m3 one. nice to get but a 328 one should do just as well.</blockquote>