From this web site AMG Center
35% faster shifting, I want one (transmission)A limited-production supercar, the SL65 AMG features the most powerful Mercedes-Benz SL model in production.
Its 6.0-liter twin-turbocharged V-12 engine delivers over-the-top power and performance, sending the SL65 AMG from 0 to 60 in a mind-numbing 4.2 seconds. The engine, capable of 604 horsepower and 738 lb-ft of torque, features a high-strength, balanced forged-steel crankshaft, with high-performance main and connecting rod bearings and forged-aluminum AMG pistons, high-capacity fuel injectors with enlarged nozzles and a low-temperature high-capacity air-water intercooler.
A driver-adaptive AMG SpeedShiftTM 5-speed automatic transmission translates the SL65 AMG's power to the road, featuring a locking torque-converter and 35 percent faster shifting. AMG racing-derived compound brakes with 15.4" front and 13.7" rear rotors, 19" composite wheels, and dual sport-exhaust system with quad chrome tailpipes add to the total performance picture.