Available in four models the CL-Class is a two door grand touring coupe, with seating for four. The CL550 4Matic, CL600, CL63 AMG, and CL65 AMG all include Active Curve Bi-Xenon headlights, sunroof, and a Harman Kardon LOGIC7® audio system. The CL550 4Matic is powered by a 429-hp 4.6-liter V8 engine and seven-speed automatic transmission with Touchshift manual shift control. The CL600 includes a 510-hp bi-turbo 5.5-liter V12 engine and five-speed automatic transmission with Touchshift manual shift control. The high-performance CL63 AMG uses a 536-hp 5.5-liter V8 engine and seven-speed automatic transmission with AMG Speedshift manual shift control. The CL65 AMG coupe includes a potent 604-hp bi-turbo 6.0-liter V12 engine paired with a five-speed automatic transmission with AMG Speedshift manual shift control. Standard safety features include front, side, and side curtain airbags, stability control, and traction control. Nightview Assist Plus, Active Lane Keeping Assist and Active Blind Spot Assist with automatic brake intervention are available options on most models. For 2011, the refreshed Mercedes-Benz CL-Class features a new hood, fenders, grille and LED turn signals and tail lights. The CL550 has received a 4.6-liter engine in place of the 5.5-liter and the CL63 AMG has received a 5.5-liter engine with start/stop technology in place of the 6.2-liter. All models now boast standard ATTENTION ASSIST.