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We recently went into great detail about Mercedes’ new M 139 2.0-liter four-cylinder engine, the power plant that will make the new 2020 Mercedes-AMG A45S the fastest and maddest hot hatchback ever created. The automaker has announced the engine makes 415 horsepower (421 PS), or around 40 horsepower more than the similar unit it replaces. However, a new report has surfaced suggesting this crazy force-fed four-banger has even more to give and Mercedes has every intention of getting it to achieve its full potential.
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