Need a replacement catalytic converter for your 2004 Mercury Marauder? MagnaFlow offers high-quality catalytic converters engineered for 2004 Mercury Marauder sub-models and engine sizes. We combine efficient design and state-of-the-art manufacturing to meet or exceed required emissions standards. Select your 2004 Mercury Marauder requirements and state vehicle registration to buy the best Marauder catalytic converter online that fits your '04 Marauder and meets your state’s emissions compliance.