Need a replacement catalytic converter for your 1991 Cadillac Fleetwood? MagnaFlow offers high-quality catalytic converters engineered for 1991 Cadillac Fleetwood 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 Cadillac Fleetwood requirements and state vehicle registration to buy the best Fleetwood catalytic converter online that fits your '91 Fleetwood and meets your state’s emissions compliance.