Need a replacement catalytic converter for your 2011 Audi A5? MagnaFlow offers high-quality catalytic converters engineered for 2011 Audi A5 sub-models and engine sizes. We combine efficient design and state-of-the-art manufacturing to meet or exceed required emissions standards. Select your 2011 Audi A5 requirements and state vehicle registration to buy the best A5 catalytic converter online that fits your '11 A5 and meets your state’s emissions compliance.