With 735 horsepower and a Dinan-tuned suspension, the CarBahn BMW M4 is a precision-guided sledgehammer. Okay, so what the hell is a CarBahn? And what does it have to do with this $135,000, ...
This adds a switchable four-wheel drive system to the M4 Competition, allowing you to choose between four-wheel drive, four-wheel drive Sport and two-wheel drive. These come with 20in black alloy ...