As mentioned there is actually very little cosmetically out there, apart from aftermarket alloys, suspension, there is little else. On my shopping list would be replacement carbon mirror caps and diffuser, if BMW produced these I would add them in a heartbeat. I had the BMW carbon bits on my previous 1 Series, mirrors, diffuser, splitters and rear spoiler. It was expensive to buy but the fit and finish was perfect. I've only ever seen the BMW carbon splitters for the E89 and those are for the non M Sport bumper.
The aftermarket carbon mirror cap covers I ordered I never received them
Still chasing my monies of the thieving seller.
Tim.
The aftermarket carbon mirror cap covers I ordered I never received them

Tim.