I have one on my 328. I think it sounds amazing.
you need to get tips in a Y shape though. It should just be one piece. or get tips to fit on to a Y shaped pipe that you have put on.
and i would def opt for getting more expensive tips. the tips i got were like $50 and they sucked. they started to rust, so i put black rustoleum on them - plus that actually looked cool, but then because they were so cheap, they get extremely hot and i have to repaint it every couple weeks
13 Black Sapphire e92 335i - 10 Le Mans Blue e92 335i - 09 Monaco Blue e92 328i xdrive - 07 Sparkling Graphite e92 328xi