C63 Tuned picks up roughly 50whp... A pretty sizeable gain as compared to what we get.
They are just all out torque monsters, but watching the M3 vs the C63 on Top Gear did it for me. The M3 is a much more well balanced car. No disputing the C63 is fast as hell.
I have beat a couple in a straight line but don't think they were modded.
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