Caught undergoing testing near the Nürburgring, the heavily camouflaged prototype of the future S63 AMG is featuring a larger air intake, a high performance braking system and AMG wheels. [6-15]
In the earliest stages of the development of the real car, spies have caught a 2013 Mercedes S-Class mule undergoing testing on Bosch’s new winter-test base in Austria. [12-17]