Chevrolet also showed an electric hot rod called Project X, a classic '57 Chevy using a 340-hp electric motor. Chevrolet collaborated with Hot Rod magazine, which bought the car for $250 in 1965 and over the years used it as a test bed for various powertrain configurations. It has been powered by inline-six and V-8 engines and has used carburetors, fuel injection and supercharging. The battery, which Chevrolet Performance is evaluating for potential use, has been developed around a modular concept that could allow customers to scale the capacity based on range, cost, packaging and weight. In Project X, the 400-volt proof-of-concept lithium ion battery stores 30 kilowatt-hours of electricity, providing enough range "for weekend cruising," Chevrolet said.