When it was first introduced on the Mercedes-Benz A 45 AMG in 2013, the M133 engine was presented as the world's most powerful four-cylinder engine in production.
With no less than 360 hp and 450 Nm (332 lb ft) of torque from a displacement of just two liters, mainly thanks to a rather large twin-scroll turbocharger that gives a boost of up to 1.8 bar (26 psi), it makes the A 45 AMG and its two “45 AMG” brothers the most powerful in their segment by far.
A little over a year later, the bonkers powerplant is still up there when it comes to the power output, but there are some rumors that it could soon be dethroned by the engine in the upcoming Audi RS3, with the compact premium segment to become a bit more crowded in the following years.
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