The Challenger is available in three trims: base, R/T and SRT8. The base trim is powered by a new 305-hp 3.6-litre V6 with a 5-speed automatic transmission. The R/T's 5.7-liter HEMI V8 features 372 horsepower with the standard 5-speed automatic with sequential shift control, and 376 horsepower with the optional 6-speed manual. The SRT8's new 6.4-liter HEMI V8 engine is mated to a standard 5-speed automatic with sequential shift control or an optional 6-speed manual. Touring suspension, traction control, stability control, 17-inch alloy wheels, KeylessGo entry system, air conditioning and power driver?s seat are standard equipment on the SE, and the R/T adds performance-tuned suspension and steering, 18-inch alloy wheels, and a body color spoiler. The SRT8 features sport suspension with Bilstein shocks, Brembo brakes, limited slip differential, 20-inch forged alloy wheels, high-intensity headlights, dual hood stripes, heated leather seats, SIRIUS satellite radio, and a Boston Acoustic sound system. Optional equipment includes a multimedia infotainment system with 30-gigabyte hard drive and navigation system, sunroof, and performance tires.In addition to the new 3.6L and 6.4L engines, changes for 2011 include a revised lower front fascia, a new door handle design, and a new steering wheel design. The KeylessGo entry system is now standard on all trims.