100% agree that BMW marketing has done it's homework & basically created a car for every niche. IMO, they ditched the N54 motor because they realized it had way too much power potential and was taking away from M3 sales (hence why the 335is utilized the N54 when the N55 was being used in the normal 335i at the same time). Other problem with using the twin-turbo setup on the N54 is that the next F80 M3 (all this is rumors) is supposed to also be a twin-turbo setup. Excluding displacement & the DCT trans, it probably would be very difficult for a substantial performance difference to exist between two different 6-cylinder, twin-turbo'd engines.
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