Freshened up for the new year, the SL Class is a luxury two-seat sports car with a retractable hardtop. It is offered as the SL550 (5.5-liter V8 - 382 horsepower), SL600 (5.5-liter V12- 510 horsepower) and SL65AMG (6.0-liter V12 - 604 horsepower). All models have a power folding retractable hardtop and a five-speed electronically controlled automatic transmission.