As the simplicity, boxy shape, and light weight of the BMW E30 steadily gains popularity with enthusiasts on a budget, we keep finding interesting ways to modify them. And we'll just come out and say it: this is the best way. By swapping the S54 Inline Six from an E46 M3, the 5-speed gearbox and steering rack from an E36 M3, and proper suspension and tires, this is simply one of the best project cars I've ever driven.