Three letters are all it takes to make car fans’ hearts beat faster: SLR. In the 1950s the Mercedes-Benz SLR 300 celebrated victory after victory with the British racing driver Stirling Moss. It does 0-60 in under 3.5 seconds, top speed of 217 mph (350 km/h), has a million dollar price tag and extremely limited (only 75 will be produced).