One engine and drivetrain configuration is available on the S63, namely a 4.0-liter twin-turbocharged V8 that is more powerful than the older and bigger 5.5-liter twin-turbo V8 previously fitted to this coupe in the 2017 model. The current powerplant is mated to a nine-speed MCT automatic gearbox that sends 603 hp and 664 lb-ft to all four wheels when necessary, and only the rear wheels when possible. This ensures phenomenal standing-start acceleration and helps add to available grip levels in the corners too. Thanks to the intelligence of the automatic gearbox, as well as the breadth of torque across the rev range, acceleration in any gear is effortless, and in Comfort mode, gear changes are almost imperceptible. With an adaptive exhaust system, the massive coupe can also be made to give off pops and bangs on the overrun by simply switching to Sport.
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