An available 6-speed automatic transmission and the return of the high-performance Z06 model mark 2006 for Corvette. Chevrolet's two-seat V8 sports car comes as a coupe and convertible. Coupes are hatchbacks with a lift-off roof panel. Convertibles have a manual-folding fabric top and heated glass rear window; a power-folding top is optional. Base models have 400 hp and a 6-speed manual transmission. Replacing a 4-speed automatic, the optional 6-speed automatic includes steering wheel paddles for manual operation. Z06 is a hatchback coupe with fixed roof panel. It has 505 hp and mandatory 6-speed manual. All Corvettes have ABS, traction/antiskid control, and run-flat tires. Side airbags are standard on convertibles, optional on coupes. Z06s have specific suspension, tires, and brakes. Optional on base models is GM's Magnetic Selective Ride Control that automatically adjusts firmness within two driver-selectable modes. Also available is a high-performance Z51 package that has a firmer, nonadjustable suspension.