The Titan is offered in four trim levels: S, SV, PRO-4X and SL. All are powered by a 317-hp 5.6-liter Endurance V8 engine, mated to a five-speed automatic transmission with Tow/Haul mode. When properly equipped, the Nissan Titan King Cab has a 9500 pound towing capacity and the Crew Cab has a 9400 pound towing capacity. Safety features include active front head restraints, dual front airbags, anti-lock disc brakes and a tire pressure monitoring system. Standard equipment for all models include side curtain airbags, panic brake assist, and electronic stability control. The PRO-4X and the SL trims feature standard hands free Bluetooth wireless connectivity.The 2011 Nissan Titan is carried over from 2010. Trim names have been changed and there have been a few changes to the content of some optional equipment packages.