Trust me, don't do it. Just get a 335i M-sport or 328i M-sport... when everything is said and done, it will cost you more retrofitting, not to mention, some parts may not be compatible.
Unless you can part out those OEM parts for a really good price, you are better off going with an M-sport. Saves the hassle, the labour, and storage space for the original parts that come off your car.
I did it on my E90, and it's a lot of money and time to deal with it.
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MY07 A22 E90 N52Nxi
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