[kenand1988]

I'm looking at diffusers for the back and would love to get a dual tip setup but don't know what I'm getting into yet. The stock diffuser if you can call it that looks completely attached to the rest of the bumper which would mean either buying a whole new bumper or cutting the part out i'm replacing with an aftermarket diffuser. I've seen on some bmw 3s that the rear diffuser can pop off like its own piece. I have a 2012 F30 328i

[BimmerF32_430i]

Depends if it's m sport or not. M sport has diffuser whereas the others don't.

[FutureDesignCarbon]

you can cut the non M-Sport bumper to fit dual tip, if you don't want to cut it, M-Sport bumper is the only option.