Honestly, all things considered, at this poit it's more profitable to convert an M240i into an M2. Bigger intakes, LSD by AC Schnitzer, small software tune and bump it to 400 hp. And it would be surprisingly more reliable too.
I don't see why people are willing to spend 40k or more on these when decent M240i's can be had for like 25.
I also heard the same from Z4M / Z4 3.0si owners who are happier with the top trim non-M because the ride isn't as harsh.









