The long wheelbase, four-door Wrangler Unlimited is available in two-wheel drive or four-wheel drive. Trims offered on the Wrangler Unlimited are Sport, Sahara (two- or four-wheel drive); or the Rubicon in four-wheel drive only. The standard 3.8-liter V-6 engine produces 202 horsepower, and the standard transmission is a six-speed manual with overdrive. An optional four-speed automatic with overdrive is available. Electronic stability control with roll control, traction control, brake assist and hill hold control are standard on all Wranglers. The Sahara offers body color flares, Infinity speakers, remote keyless entry, power window, security alarm and 18-inch wheels. The Rubicon features equipment that off-road enthusiasts usually add anyway, including heavy duty axles, front and rear electronic locking differentials, 32-inch BF Goodrich mud tires, sway bar disconnect system, rock rails and a heavy-duty transfer case with 4:1 low-gear ratio. The available Freedom Top three-piece modular hardtop allows panels to be removed above the driver or passenger. Other options include Dual Top Group, half doors, remote start system, front seat-mounted side air bags, and a multimedia infotainment system with 30-gigabyte hard drive and navigation system. The Sport trim replaces the X trim for 2010.