The four-cylinder engine pumps out a continuous total of 376 horsepower and 354 pound-feet of torque, while the 48-volt, belt-driven starter-generator can provide a brief boost of 13 extra horses. The 48-volt setup also allows the SL43 to recoup energy while slowing and smoothing out the engine’s start-stop function. The M139 is, for the first time, mounted longitudinally in the SL43 and linked to a nine-speed automatic transmission with the AMG-typical wet clutch pack in place of a torque converter. Mercedes claims the rear-wheel-drive roadster can hit 62 mph in 4.9 seconds on its way to a 170 mph top speed.
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