-Encased under glass and lit up like a museum piece, Audi’s ten-cylinder totem to human ingenuity looks as if it should be accompanied by a soft-spoken docent to narrate its very existence: At 610 horsepower, this naturally aspirated 5.2-liter V-10 is the most powerful engine ever put into production by Audi. It revs 20 percent quicker than its predecessor, spinning from idle to full load in 0.66 second, and maxes out at 8500 rpm. READ MORE ››
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