The XF comes in four trims: Base, Premium, Supercharged and XFR. Both the Base model and the Premium model are powered by a 385-hp 5.0-liter V8. The Supercharged and XFR models add a supercharger to the 5.0-liter V8 to produce 470-hp on the XF Supercharged and a whopping 510-hp for the XFR. All engines send power to the rear wheels via a six-speed automatic transmission featuring Jaguar Sequential Shift and steering wheel mounted paddle shifters. Safety features for all models include dual-stage front, seat-mounted side and side-impact curtain airbags, active head restraints, and a tire pressure monitoring system. Standard equipment on all models include Keyless start, voice-activated navigation, Bluetooth, heated leather front seats and Sirius satellite radio. In addition the Premium model receives standard Bi-Xenon headlights, blind spot monitor, front and rear parking aid with camera, keyless entry and cooled front seats. Building on the XF Premium content, both XF Supercharged and XFR standard features include adaptive dynamics and active differential control, heated steering wheel, rear window sunblind and a 400-watt sound system with HD radio. The XF Supercharged includes 16-way power driver and 12-way power passenger seats, while the XFR includes 18-way power driver and 14-way power passenger seats. For 2011, the base XF model moves from the old 4.2-liter engine to a 5.0-liter that produces an extra 85-hp, bringing the total to 385-hp. XF, XF Premium and XF with Portfolio package move from a six-disc CD changer to a single-slot in-dash CD player.