The BMW M1 (or 1M) is making its presence known on the 'Ring and elsewhere... including in the background of our 2012 BMW M5 spy photos. One more shot below.

Special thanks to The.Dude.Abides for pointing out the little Bimmer in the background, which should be powered by a torquey version of the twin-scroll turbocharged 3.0-liter straight-six in the portly 535i GT.