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It began with the SL550, then the SL63 AMG and now, the all-new V-12 SL65 AMG. With a 6.0-liter biturbo twelve-cylinder engine, the SL65 puts down 621-hp and a tremendous 738 lb-ft of torque, getting from zero to 60 in 3.9 seconds and on to a limited 186 mph. In this walk around, hear Rob Moran, Product Manager—AMG, discuss the SL Roadster's most powerful incarnation ever. -- Published on March 27, 2013