Need a replacement catalytic converter for your 2003 Porsche Cayenne? MagnaFlow offers high-quality catalytic converters engineered for 2003 Porsche Cayenne sub-models and engine sizes. We combine efficient design and state-of-the-art manufacturing to meet or exceed required emissions standards. Select your 2003 Porsche Cayenne requirements and state vehicle registration to buy the best Cayenne catalytic converter online that fits your '03 Cayenne and meets your state’s emissions compliance.