Quote:
Originally Posted by jphughan
Take a look at the differences between the M50/S50, M52/S52, and M54/S54 engines, or even the N63/S63 engines in the FI camp to see what I'm talking about. M doesn't make an M engine by adjusting a tune and calling it a day.
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Are you trying to argue that the S63 isn't easily tuned? If anything, the switch to FI on S series engines is making tuning potential much easier and cheaper than on the previous n/a motors.