Chevrolet revamped its 2-seat sports car for 2005 with revised styling, more power, and new features. Dubbed the C6 to denote Corvette's 6th design generation since 1953, the '05 came as a hatchback coupe with lift-off roof panel or as a convertible with a fabric soft top and heated glass rear window. A power top was newly available. Wheelbase grew 1.2 inches vs. the 1997-2004 C5, but overall length shrunk 5 inches. Fiberglass body panels again clothed a metal structure. The sole engine was a 400-hp 6.0-liter V8, up 50 hp from the C5's 5.7-liter V8. Transmission choices remained a 6-speed manual or 4-speed automatic. Standard were ABS, traction/antiskid control, and two suspension options. GM's Magnetic Selective Ride Control automatically adjusted firmness to match road surfaces within driver-selectable Touring and Sport modes. A Z51 package had a firmer nonadjustable suspension, larger brakes, and, with automatic transmission, acceleration-enhancing gearing. Standard run-flat tires returned, but wheel diameter grew an inch to 18 front, 19 rear. Front side airbags were standard on the convertible, optional on the coupe. Xenon headlamps were newly standard, as was keyless access and ignition. New options included OnStar assistance, navigation system, and satellite radio. Heated seats and a head-up display that projects gauge readouts onto the windshield were optional.