Need a replacement catalytic converter for your 1991 Ford Explorer? MagnaFlow offers high-quality catalytic converters engineered for 1991 Ford Explorer sub-models and engine sizes. We combine efficient design and state-of-the-art manufacturing to meet or exceed required emissions standards. Select your 1991 Ford Explorer requirements and state vehicle registration to buy the best Explorer catalytic converter online that fits your '91 Explorer and meets your state’s emissions compliance.