The 6.2 liter in the C63 is the same engine, bore & stroke, compression, etc. that is in other "63" Mbenz. Mercedes detunes the engine in the C63 from 518HP (at the crank) to 451HP. That is why a NA motor can gain that much HP from just an ECU flash. Check out the following videos:

Stock C63: http://www.youtube.com/watch?v=xOm6JGhIMok

Tuned C63: http://www.youtube.com/watch?v=hkBtbo9JBoc

This C63 is running the same M3 before and after just an ECU flash.

 

Holly batman SOHC v8 benz pwr!

 

Can you guys post some of the tunners that do this ECU tune?

Could a dealership do this if I knew a tech or do they need the correct mapping etc?
TIA

 

EDIT: Found the answer

 

great numbers for a striaght line racer