M3 who? Sorry BMW, you're gonna to have to equip the next M3 with more than just a 400-hp V8 if you hope to keep up with MB's upcoming C63 AMG. We've seen enough spy shots of the garden variety C-Class than we care to admit, but there's something about a car in camo sporting a 6.2L V8 producing a downright silly amount of horsepower that grabs our attention. How does 503 horses work for you? Forget about the M3, AMG is fishing for the M5 with this one.

[Source: Car and Driver]