BMW M’s Secret CSLs You’ve Never Seen Before – Part 2: V10 E60 M5 CSL + V10 E63 M6 CSL | Top Gear

Ever since BMW’s M Division started business back in 1972, only three cars have ever officially worn the ‘CSL’ moniker. The original 3.0 CSL everyone of a certain age gets gooey over, the E46-generation M3 CSL that warms the dark heart of the internet, and the latest M4 CSL. However, there were four secret CSL prototypes that never saw the light of a Munich day, at least until now. In part one, Top Gear Magazine’s Ollie Marriage looked at an E46 M3 CSL with an E39-gen M5’s V8 shoehorned under the bonnet, and a prototype F87 M2 CSL that featured elements from the M4 GTS. Here’s a link in case you missed it: In this second part, Ollie looks at two secret CSLs from the generation of M that famously went hardcore: the E60 M5 and the E63 M6. Both shared a naturally-aspirated V10 engine making them the most uncompromising M cars of the time. Yet the folks at M Division still went ahead and secretly intensified them, by boring and stroking the engines