i don't know much about the c220 kompressor engine, but there are apparently a number of options for significantly improving the power of your 16v engine -- primarily increasing the displacement to 2.5 - 2.6 liter, new pistons, valves, crank, etc. I would investigate that route, first (Bekkers, Renntech?, AMG (may no longer be available)...there may be others.) I have heard of these engines producing up to 300hp (probably not street legal) but lower outputs may be more street-friendly.