Need a replacement catalytic converter for your 1985 Audi 4000? MagnaFlow offers high-quality catalytic converters engineered for 1985 Audi 4000 sub-models and engine sizes. We combine efficient design and state-of-the-art manufacturing to meet or exceed required emissions standards. Select your 1985 Audi 4000 requirements and state vehicle registration to buy the best 4000 catalytic converter online that fits your '85 4000 and meets your state’s emissions compliance.