why does the m3 already have a supercharger, but the 6.3 doesnt?
Maybe the OP meant that some M3s have aftermarket superchargers put on them and he hasnt seen it done on a C63 yet?
http://www.m3post.com/forums/showthread.php?t=241588
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The brabus version does work but its as much as a car so it does not count.
I have spoken to several tuners and the ECU used in the 6.3 is so strict and complicated that it would be next to impossible to make a car with positive manifold pressure while still using anything based on the OEM ECU.
That and the fact that you can get 600 hp out of the car with some bolt ons means a blower is just not that helpful. It will just lead to check engine lights and cracked pistons IMHO.




