Not so much a redesign as a whole new interpretation of Chevrolet’s venerable sports car, the eighth-generation Corvette — which was all-new last year — is a mid-engine two-seater with a 490-horsepower, 6.2-liter V-8 engine and an eight-speed dual-clutch automatic transmission driving the rear wheels. Competitors include the Audi R8 and the Porsche 718 Cayman and 911.