C5 Corvette Black Smooth Air Intake Coupler PLUS C5 Air Flow Booster Fits: All 97 through 04 Corvettes Fits All C5 Corvettes 97 Through 04. Add 15-20 horsepower. Offered with Black Smooth Air Coupler and C5 Air Flow Booster. Improve Gas Mileage. Improve Acceleration Throttle response.