Gpower supercharged M3 vs Modded m5. The owner of the M3 claims the M5 has 600 hp, but I think 550 would be more realistic, and I think the M3 also has around 550. The m3 lets the m5 get the hit and still pulls him HARD.
http://www.youtube.com/watch?v=DksvQU1YDr8
http://www.youtube.com/watch?v=DksvQU1YDr8