the engine has been tuned down some. E36/7 drivetrain can't take all the power. 321 bhp or so, and less torque also. Its still damn fast, but its old technology so the susp. won't be as good. Don't forget that the E36/7 still uses parts from the E30, and the E30 wasn't designed for so much power. But for the cost savings and the fact that it's so much damn fun do drive those little guys.