List the nomenclature, M, RS, and GT3, and you should already be counting the horsepower. AutoWeek has caught a trifecta of German high-performance cars testing their killer powertrains. The next M3 will be powered by a 4.0-liter 400 horsepower V8, Audi throws a V10 in their sedan to pump the RS6 to 550 horsepower and Porsche has lightened the GT3 and worked 400 horsepower out of the 3.8 flat-six. Forget about counting sheep.


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