Behind Closed Doors: BMW's hidden supercharged WR 750

The BMW Museum is the first port of call for any petrolhead visiting Munich. But there's an even more extraordinary collection of machinery just down the road, at the BMW Group Classic headquarters. Set inside the original Bayerische Motoren Werke factory, BMW Group Classic houses offices, archives, conference rooms and a café. But it's also home to a small gathering of rare and vintage BMW motorcycles and cars, and a couple of laboratory-level workshops. Access to this remarkable hoard is by special appointment only—but on this day we had one such appointment. And it was during a behind-the-scenes tour that...