Need a replacement catalytic converter for your 1981 Audi Coupe? MagnaFlow offers high-quality catalytic converters engineered for 1981 Audi Coupe sub-models and engine sizes. We combine efficient design and state-of-the-art manufacturing to meet or exceed required emissions standards. Select your 1981 Audi Coupe requirements and state vehicle registration to buy the best Coupe catalytic converter online that fits your '81 Coupe and meets your state’s emissions compliance.