I was disappointed when I read the specs of the E9* M3 with the V8. The torque is.... low. I am thinking of keeping my Z4M Coupe with the S54 and then supercharging it once the warranty runs out....
I have gone in a straight line with 335's. The Z4M is somewhat faster but not all that much faster. I have only done this to 100kph because the limit was 90kph on that road coming out of a red light. I refuse to get into "road races".