Mercedes-AMG has unveiled the 2027 GLS63 and GLE63 S performance SUVs, both powered by a new 603-horsepower V-8 engine. The powertrain delivers acceleration that reaches 60 mph in under four seconds, with a top speed of 174 mph.
The new V-8 replaces the previous twin-turbo configuration and represents Mercedes' commitment to keeping naturally aspirated and traditionally turbocharged large-displacement engines in its high-performance lineup despite the industry's shift toward electrification and downsizing. This engine develops serious output while meeting modern emissions standards, a balancing act that separates AMG's vehicles from competitors relying on hybrid systems or smaller turbocharged powerplants.
The GLS63 and GLE63 S target luxury performance SUV buyers who prioritize raw engine character and conventional power delivery over hybrid efficiency. BMW's X7 M and X6 M models offer comparable positioning, though they employ turbocharged inline-sixes paired with electric motors. Porsche's Cayenne Turbo S leans on forced induction as well. Mercedes is betting that a substantial displacement and cylinder count still matter to buyers willing to spend $100,000 or more on an SUV.
The sub-four-second sprint time aligns these SUVs with some sports cars from just a decade ago. That performance envelope reflects the broader trend of turning three-row and two-row luxury SUVs into near-supercar acceleration machines. Weight and aerodynamic efficiency have improved enough that eight cylinders can produce startling straightline speed even in vehicles designed for cargo and passenger comfort.
Transmission details and all-wheel-drive configuration remain unclear from the available information, though AMG typically pairs its powertrains with nine-speed automatics and intelligent torque distribution systems. The