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@Wiegert to me the engine makes it uncool free. It's just so good. And special.
I'm going to have to go with @Weigert on this one. The engine in the M3/M4 is a total let down. Yes it's powerful and efficient, but it sounds atrocious and isn't as smooth as the N55 or the outgoing S65.
M3s have always sounded beautiful, but the M4 sounds like a 1980s Volvo with a broken muffler. I still have no idea how/why they made it sound like that when every other BMW inline 6 engine ever made sounds so good (including all other I6 turbos currently offered in the range)