America's longest-lived sports car mostly marks time for the fourth year of its current design. Corvette retains its traditional 2-seat fiberglass body construction in hatchback, convertible, and fixed-roof hardtop styles. All have a 345-horsepower V8, newly retuned for low-emissions-vehicle standards, plus traction control, "run-flat" tires that eliminate the need for a spare, a tire-pressure monitor and, also new, an "active" remote keyless-entry system instead of a "passive" type. The hardtop is sold only with 6-speed manual transmission and a sport-tuned Z51 suspension, now with thicker stabilizer bars, that's optional on the convertible and hatchback. Those models come with automatic transmission and offer either a base suspension or an optional one with three-mode driver-adjustable shock absorbers. Available for all Corvettes is Active Handling chassis control, which applies individual brakes as needed to keep the car on line in hard cornering maneuvers. Last year's optional head-up display, which projects instrument readouts onto the windshield, is newly available for the hardtop. The convertible retains a manual folding top with electrically defrosted glass rear window.