Welcome to the Wagon Gang. I also have converted my 2011 Metallic Black Sapphire 328i E91 into what I call a M+. I have a mixture of M3, M-Sport,Mtech components. From M3 fenders, Mtech rear bumper w/carbon fiber diffuser, M3 brakes and sway bars/bushings/control arms, Msport Seats and steering wheel. Along with all the engine and exhaust upgrades for better breathing and power.
My Non oem fenders fit perfectly. I currently run the lates AA tune with their cat back exhaust system. I am waiting to install AA headers. One thing I would point out is with the upgraded power and stress I have gone through coils and plugs a bit quicker then normal.
Good luck with the build and keep us updated!
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