Mercedes' S63 AMG and S65 AMG have been facelifted for 2010, and feature more aggressive styling.

For some drivers, it's not enough to arrive in a 600-horsepower luxury sedan, they've got to make sure that everyone knows it's a 600-horsepower luxury sedan. For these buyers, the facelifted 2010 Mercedes S63 AMG and S65 AMG are good news. As the flagship sedan has gotten updated for the new year, so has the high-performance version. Details have been leaked by Mercedes' German online configuration website, which has images of the S63 AMG and S65 AMG ahead of the car's official Shanghai Auto Show reveal.

The new S-Class AMG models are more distinguished from the standard S-Class, with a larger front air intake below the bumper. The round foglights have been replaced by strips of LED lighting. There are LED taillights as well. The S63 AMG and S65 AMG get individual grilles to distinguish them--though, if you're good, you'll be able to tell them apart by the size of the quad exhaust outlets.

Power remains impressive, with the S63 AMG's 6.2 liter V8 putting out 518 horsepower and 465 pound-feet of torque. AMG's seven-speed automatic transmission is used. The S65 AMG is the "Big Daddy" of the Mercedes sedan family, with a twin-turbo 6.0 V12 that's got 604 horses on tap. The S65's 738 lb-ft. torque rating requires a five-speed automatic to handle the torque, and offers more grunt than the competition from BMW. Mercedes' ESP stability control does its best to keep these super-sedans docile, though sometimes it's a losing battle.

Gallery: 2010 Mercedes S63 AMG & S65 AMG Facelifts Revealed