Were you interested in the supersprint because of the quality and sound? I don't know anyone that would spend over 1k for basically just a muffler. I have had an ActiveAutowerkes axelback on my n20 for almost a year and for half the price of supersprint along with the same quality and sound, seems like a better deal. I'm biased but I'm just letting you know what else is out there.
It's on sale actually too
http://store.activeautowerke.com/col...e-bmw-f30-328i