Caught undergoing testing near the Nürburgring, this lightly camouflaged prototype of the future S63 AMG features a larger air intake, a high-performance braking system and AMG wheels. Delivered by the pro shooters at Brenda Priddy & Co., it remains unknown yet what engine will be used.

The team speculates that the most likely option is a 5.5L V8 turbo for the S63, and a bi-turbo variant of that very engine for the S65—both mated to a seven-speed Speedshift MCT transmission.

Photo: Brenda Priddy & Co.