Find me any exhasut that if you have a problem with it you're not going to be stuffed? That's like me saying I won't buy BBS wheels as if I have to send one back I'm knackered

Sound of an exhaust is a personal thing to be fair to you, and if you say you don't like the sound I can't argue that for a moment. As far as I can work out however, from your posts your only valid arguement behind them being, as you put it "pish" is the sound.

Your trusted mate's story sounds less than credible and that's if I'm being generous. How many modified cars does your mate see at BMW? Obvisouly loads of owners are into changing bits of their cars for him to have seen so many failures from one manufacturer. Most of my mates that work at dealers rarely see anything that deviates from the standard cars spec.