8. BMW E30 M3
The E30 M3—i.e. the first M3—has attained an almost mythical status as a nearly perfect car. As a so-called homologation special, the M3 is a normal 3-Series BMW that was tweaked to qualify an engine, and some suspension pieces, for various racing series. It was no doubt great, as its motorsport record is unmatched. The engine, though, had a tendency to explode in a rather costly fashion, and is very often the first thing that gets yanked when someone’s planning on actually using the car for fun. Aside from a few minor differences, then, it’s back to being just a normal 3-Series at that point.