BMW M3 is the track ready road legal 3-Series model from the BMW. On its exterior, M3 usually have a wider fender with aggressive front and rear bumpers. On its performance, BMW M3 have a bigger displacement compare to day to day BMW 3-Series.
The 3-Series and M3 evolved from time to time but they still remain its DNA as performance car. Enjoy the this short video on BMW M3 by ElectricFederal.