There is a guy in Norway who are fanatics about these BMW V12`s. He just finished a single turbo V12 and have a twin turbo from before. The TT V12 motor is stock and the single turbo V12 is built. TT motor maxed out the dyno last year 750 rwhp video 1 video 2

Single turbo V12 has so far dynoed 814 rwhp on ONLY 1.1bar. Owner hopes to max the turbo out, 1800 bhp.