Porsche 958 Cayenne V8 Induction/Turbo/S/GTS (up to 14) - Post Cat Spare PipesThese lightweight spare pipes fit in place of the heavy secondary pipese. Using spare pipes removes the flow restriction the cats place on an exhaust system, while increasing the horsepower. The silencing effect of the cats are also removed, enhancing the aggressive engine sound. Spare pipes are ideal for track days and race application. CAPRISTO Exhaust systems are engineered and manufactured utilizing advanced 3D Laser Scanning, CAD Design, Digital