Receiving a major update, the rear-wheel-drive 2009 Mercedes-Benz SL-Class two-seat roadster with retractable hardtop now features a re-sculpted exterior, including a larger front air dam, pronounced side grilles and sleek new side mirrors. The retractable hardtop is operated via a SmartKey remote or console switch. The SL550 is powered by a 5.5L V8 that produces 382 hp and 391 lb-ft of torque paired to a seven-speed automatic transmission and goes 0-60 in 5.3 seconds. The SL600 has a 5.5L twin-turbo V12 that makes 510 hp and 612 lb-ft of torque attached to five-speed automatic and runs 0-60 in 4.4 seconds. The SL63 AMG features a 6.2L V8 that cranks out 518 hp and 465 lb-ft of torque, with the new Speedshift MCT seven-speed automated-transmission, and takes 0-60 in 4.2 seconds. The SL65 AMG is propelled by a twin-turbocharged 6.0L V12 that spits out 604 hp and 738 lb-ft of torque with a five-speed automatic and rates 0-60 in 4.2 seconds. Fuel economy for the 6.0 and 5.5 V12 is 11 mpg city/18 hwy, while the 6.2 gets 12/19 and the 5.5 V8 gets 13/21. Mercedes-Benz SL-Class safety features include stability and traction control, antilock brakes with brake assist, side head/thorax airbags, driver knee airbag and a pop-up roll bar that deploys automatically in the event of a rollover.