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Porsche Rear Spoiler Air Duct Left - 911 08-09 997-512-771-02 9935058430101C Porsche Crankcase Check Valve forPorsche Rear Spoiler Air Duct (Left) For Porsche 997 (2008 2009) Models. Enhance the aerodynamics of your Porsche 911 (08 09) with the Rear Spoiler Air Duct. This high quality, left sided air duct is designed to improve the airflow around the rear spoiler, resulting in increased downforce and stability at higher speeds. Manufactured to exact specifications, it's a must have for any performance vehicle.