Mercedes has massaged the A45 AMG hatchback to get even more power from its 2.0L 4-cylinder engine. In fact, the 381hp output for the four-banger turbo makes the engine the most powerful 4-cylinder around. The power bump grabs the most powerful four title away from Audi (who took it from Mercedes) dethroning the Audi RS3.
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https://www.slashgear.com/mercedes-a45-amg-bumped-to-381hp-29390924/
