Didn't know BMW's never went wrong!!! Reminds me of an ex girlfriends father who didn't want her to get a Golf, saying VW's are ok until they go wrong. He preffered Vauxhalls, I argued all cars are ok until they go wrong.
BBR are well experienced in making many cars perform better through well chosen modifications, they will undoubtedly be offering a warranty with the conversion in a similar way to Cooper Works do on the Mini.
As the previous posts said, it offers M3 performance without the it being a BMW, for a select number of car enthusiast without sheeps brains, this is enough.
Caeser ruled with an iron hand, then with a wooden foot and finally with a piece of string.