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 6.4-liter HEMI V8 engine is mated to a standard 5-speed automatic with sequential shift control or an optional 6-speed manual, and produces 470 horsepower and 470 lb-ft of torque. 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 base trim, 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 two-mode active dampening, Brembo brakes, limited slip differential, 20-inch forged alloy wheels, high-intensity headlights, dual hood stripes, heated leather seats 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. For 2012, two-mode active dampening suspension and Parksense rear parking sensors are now standard on the SRT8 trim. Ready Alert Braking, Rain Brake Support and Hill Start Assist are now standard on all trims.