Wish I would have got premium sound system. Didn't think I would listen to the stereo as much as I have and notice the tweeters crackle a little bit. I agree with the back up sensors pretty pointless. I would eater install a back up camera. Also in regards to Alex Roy, he has a book called the Driver covering his race across the US from New York to LA. It's actually an ok book.
2013 E92 M3
Space Grey/Fox Red Novillo