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