For more than half a century, the flagship Mercedes-Benz coupe has advanced the state of the art, with industry-changing breakthroughs and uncompromising pillarless style. The S-Class Coupe is a enthralling symphony of smooth and sharp. An ideal balance of strong and sensous. And an irresistible blend of power and intelligence. The 449-hp biturbo V8 of the S550 4MATIC combines quick response with the efficiency of ECO Start/Stop. It can precisely self-tune its Direct Injection and multispark ignition in a millisecond. Its active exhaust matches its intoxicating power with an enticing soundtrack, unleashing a subtle growl at startup and in the throes of acceleration.