A friend had one in the UK on his e46 m3 (was fitted to the car when he bought it). Far too loud in my opinion, sounded great on wide open throttle, but on the day to day commute, it sounded like a honda. Depends what you use your car for, but i wouldn't fit one. On the plus side, I'd a good look at it when removed and it seemed good quality and was very light! If you PM me your number I'll whatsapp you a video I have of it (might give you some idea).