The new Mercedes-AMG GLS 63, with a longer wheelbase than its predecessor, is powered by a 603 horsepower 4.0-liter V8 biturbo engine mated to a AMG SPEEDSHIFT TCT 9-speed automatic transmission equipped with an integrated EQ Boost starter-generator that unites a starter motor and an alternator in a single electric motor integrated between the engine and the transmission providing up to an additional 21 horsepower of output.
