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This Kenne Bell twin-screw supercharger has been tested to increase power on the '04 Z06 Corvette engine an extra 195 horses on pump gas (600 hp versus 405 hp stock). That's at just 8 psi. Adding more boost raises the power significantly. These blower kits mount on top of the engine, face forward, and include a big throttle body, a cool-air system, and a billet fuel system.