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From what I understand (Drag or from a roll racing)
FBO N54 (Downpipes, mids, tune, intercooler, intake) will loose against a stock C63 - (JB4 - If you filled up with 40% E85 and ran Map 5 it could be darn close though).
FBO + meth N54 will just beat a stock C63
Tuned C63 including P31 pack etc will beat a FBO + Meth N54.
To beat a Tuned C63 you will need RB's, FBO + meth.
To trash a C63 a single turbo conversion.
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