Debuting on the 2020 Mercedes A45, the S version of the M 139 makes 416 hp at 6,750 rpm and 369 pound-feet (500 Newton-meters) of torque between 5,000 and 5,250 revs. The redline hits at 7,200 rpm.

There's also a standard variant of the M 139 that produces 382 hp (285 kW) at 6,500 rpm and 354 lb-ft (480 Nm) between 4,750 and 5,000 rpm. The redline is the same 7,200 revs.

Both versions of the M 139 use a twin-scroll turbocharger. The S variant can produce up to 30.5 psi (2.1 bar) of boost, but the standard model goes to 27.6 psi (1.9 bar).

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