In a surprise move, Mercedes will introduce the facelifted 2011 CL-Class at the Goodwood Festival of Speed. The updated model features a revised grille, modified bumpers, restyled headlights (with integrated LED daytime running lights), LED fog lights, new tail lights, and a sportier exhaust system. Inside, there doesn't appear to be any updates besides the addition of wood trim above the COMAND controller. Despite the minor styling revisions, there are big changes under the hood. The CL550 4Matic gets the new twin-turbo 4.6-liter V8 BlueDIRECT engine with 435 PS (429 bhp / 320 kW) and 700 Nm (516 lb-ft) of torque. It allows the luxo-coupe to accelerate from 0-60 mph in 4.9 seconds. Likewise, the CL63 AMG is outfitted with the new 5.5-liter biturbo V8 which produces 544 PS (400 kW / 537 hp) and 800 Nm (590 lb-ft) of torque. The CL600 boasts a twin-turbo 5.5-liter V12, with 510 hp (380 kW / 517 PS) and 612 lb-ft (829 Nm), which enables it to run from 0-60 mph in 4.5 seconds. The other V12 model, the CL65 AMG, has 621 hp (463 kW / 630 PS) and 738 lb-ft (999 Nm) of torque. Besides the styling and performance upgrades, the 2011 CL has improved technology. Goodies include Active Lane Keeping Assist, Active Blind Spot Assist, Attention Assist, Night View Assist Plus, and Active Body Control with crosswind stabilization. Look for the 2011 CL to start arriving at US dealerships this fall.