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Exhaust Catalytic Converter Bypass Pipes DesignTek Cat bypass pipes, fits all 996 1997 onward models 2ND ARY CATALYTIC BYPASS PIPES. This product may trip the engine check light, you will need to either re-map the vehicle so that it is reading the lambda sensors correctly, or fit some extra lambda sensor extensions our part number 00060612300, the product has holes for the lambda sensors. The cat bypass will increase the power delivery also give the car a deeper sporty sound. Details: - More power and sportscar sound. - More power on 996 +9HP. - Saves 30lbs 15 KG from rear of your 996.