The W204 C63 AMG is a performance enthusiasts dream. Its small size a and power to weight ratio makes it a nimble car with lots of power to spare. Mercedes fans know that standard C63's has what many would call a detuned M156 engine, as seen in the larger 63's of the time. With simple tuning that allows the throttle body to open all the way  you now have the the power of the larger 63 AMG's but in a lighter package. Throw some more tuning at it along with a set of MBH long tube headers and you can see gains well over 100 wheel horsepower vs stock. This is why the Naturally aspirated W204 C63 will go down as one of the best performance sedans ever.