Need a replacement catalytic converter for your 2003 Jaguar S-Type? MagnaFlow offers high-quality catalytic converters engineered for 2003 Jaguar S-Type 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 Jaguar S-Type requirements and state vehicle registration to buy the best S-Type catalytic converter online that fits your '03 S-Type and meets your state’s emissions compliance.