More HP from AMG?
Yes if you live in Europe and have a C55 made for the European market.
No if you have a car for the North American spec AMG.
Short answer for you, No. At least not yet. Hopefully AMG will begin to realize that there is a high number of AMG gearheads (like ourselves) that would immediately purchase the upgrades that they currently offer in Affalterbach.
Why haven't you considered Kleemann or Renntech?
Additionally, what are you ultimately looking for? Simply more power? Or traction and handling as well?


