One of the best ever made was BMW’s S54 Inline 6 that was in the E46 M3, E37 Z3M, and the E85/86 Z4M. 3.2L iron block that revved to 8000 rpm and made 333hp all without the aid of forced induction. Oh, and peak power was at 7900rpm, so you were rewarded for taking it all the way to redline. It was one of the sweetest…