15: E24 635CSi
The 6-Series BMW has always been a sticking point for the brand as sort of a go-between in the 5-Series and 7-Series lines. The original 635CSi was an excellent car in every aspect. Styling was a focal point of the 6-Series and something BMW wanted to showcase. Building on the reputation of being the ultimate driving machine wasn’t an easy task (via Bring a Trailer).

Somehow BMW managed to attract buyers with this exceptional design. The 635CSi was an excellent car in every sense of the word. The M30B34 engine produced heart-pounding performance and acceleration. You wouldn’t imagine a car as old as the E24 635CSi would drive.