Originally Posted by KVA

The 63 engine will have more HP but less TQ than the 55 Kompressor models...it will also rev to 8000 RPM versus 6500 for the 55.

The 63 engine is the future for everything AMG.

I would probably go with either an M5 or the CLK63 (which has a tuned down 63 engine)...once you retune the 63 engine to bring back to it's 505HP potential you will have very similar performing cars.

M5 is wicked right off the lot...