Although on the surface it may look like nothing more than an ordinary, run-of-the-mill 451 horsepower Mercedes-Benz C63 AMG (assuming, of course, that it's possible to consider a Mercedes C63 AMG either ordinary or run-of-the-mill), pictured before you is the latest combatant set to do battle in the ever growing ring of tuned AMG C-Class models: the RENNtech C63 AMG. Boasting a pavement scorching total output of 548 peak horsepower and 510 lb-ft. of torque, RENNtech's C63 offers massive amounts of thrust across the low-to-mid rpm range, while top speed comes in at a mighty 187 mph.