Well my new 335is is here and I'll be doing it again. Never had any trouble before, enjoyed the noise. We do need an E93 and newer sedan walk through though from the sound of it.
Important to remember that this is a tiny little "tweak" really, it's only about noise, there will be no increase, decrease, etc. It might sound faster...
'13 TiAg over Coral, 335is | DCT | Prem | L7 | Nav/Idrive | CA | 19" "-------"
A BMW is Just a Car, it doesn't make you smart, handsome, cool, or wealthy. Get over it.