The early-model E36 BMW M3 (up to 1995) was preferred for the project because of the ease of tuning the OBD-I engine. The '96 and later M3s came equipped with the more restrictive onboard diagnostic software known as OBD-II. However, OBD-II isn't the only difference between the '95 and later M3s. The '95 M3 has a 3.15:1 differential, whereas the '96 and later M3s have the same 3.23:1 differential that helped make the '95 M3 Lightweight quicker. The '95 M3 was also the only model to sport a smaller, more peaky 3.0-liter (2990cc) engine, compared to the '96 and later M3s, which came with a much more torquey 3.2-liter (3151cc) engine . From the factory both engines were rated at 240 bhp, with the 3.0 putting out 225 lb-ft of torque at 4250 rpm and the 3.2L putting out 236 lb-ft of torque at only 3900 rpm.
Rett skal være rett ;)