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Exhaust Catalytic Converter Bypass PipesCayenne S models have 4 catalytic converters. The 2nd set is only to make to car extremely quiet - unnecessarily quiet. Catalytic converters are great small easily placed mufflers. Cayenne 2ndary Catalytic Bypass/replacement Pipes for the second set of stock catalytic converters. Major Gains in power and throttle response. More V8 muscle car sound without being too loud. NO Check Engine Light no C.E.L. More power +12 hp gain on the V8 S. Better than any German European systems 100% guaranteed. Taking off the useless 2nd set of 2ndary cats is 100% the most power.These cars DONT NEED backpressure. Its a wives tale! Polished mirror shine T304 Stainless Steel saves 35 lbs on the car.
