The Frontier is offered in five trim levels: S, SV-I4, SV, the PRO-4X off-road model and the luxurious SL. Available engines include a 152-hp 2.5-liter four-cylinder (S, SV-I4), mated to either a five-speed manual or five-speed automatic transmission, and a 261-hp 4.0-liter V6 (SV, PRO-4X and SL), paired with either a six-speed manual or five-speed automatic transmission. Aluminum wheels, cruise control, keyless entry and power windows, along with a manual sliding rear window on Crew Cabs, are standard on all but the S trim level. The PRO-4X and SL get a Rockford Fosgate 6CD audio system, satellite radio and Bluetooth wireless connectivity, while the SL is further equipped with heated front seats and leather upholstery. Safety features include four-wheel anti-lock disc brakes, six airbags, active anti-whiplash front head restraints, a tire pressure monitor and Nissan's Vehicle Dynamic Control (VDC) electronic stability control system, including integrated traction control. The Nissan Frontier carries over with minimal changes for 2012. Vehicle Dynamic Control (VDC) is now standard on all models; additionally, a new Sport Appearance Package debuts for SV trims, featuring 18-inch alloy wheels, dark grille treatment, body-colored bumpers and body side sport graphics.