Yeah, thats great. I've done that with kg/HP (germany):
3,52: BMW M6
3,61: BMW M5
3,71: Audi R8
3,75: BMW M3 E92 (1600kg)
3,87: BMW M3 E92 (1650kg)
3,99: BMW M3 E92 (1700kg)
4,04: Audi RS4 (based on 1700kg weight)
4,21: Porsche Carrera S
4,23: Aston Martin V8
So the M3 will be a very fast car!
Best regards, south