2021 Mercedes-AMG GLS 63
The 2021 Mercedes-AMG GLS 63 is powered by a 4.0-liter V-8 biturbo engine with 603 hp. In a first for the performance variant, the GLS 63 has an integrated EQ boost starter-generator, which combines a starter motor and an alternator in a single, electric motor integrated between the engine and transmission, Mercedes says. It provides an additional 21 hp and 184 pound-feet of torque. It has a nine-speed automatic transmission and all-wheel drive.