450HP Mercedes A45 AMG by mcchip-dkr
Whereas some other tuners are claiming similar power with the engine hardware as is and software/peripheral upgrades only

C63newdude I would'nt be too worried about that side of it, if the engines been built to suit (which it certainly looks like it is) it'll hold up to those power levels no probs - there are plenty of worked engines out there of similar displacement with even higher outputs, the problem to worry about in my opinion is the rest of the drivetrain so far I've only seen one tuner thats addressed that part of it.





