Milltek Sport has the products you need to ratchet up the sound, power and looks of your Audi A4. A Milltek high flow catalytic converter offers the ultimate in performance without any loss to mid-range torque. The exhausts that Milltek produces get a better gas flow, thanks to an increase in the bore and a full flow mandrel bend. They will look better, too. By using a stainless steel that is antimagnetic and is T304 aircraft grade, they are less likely to discolor. Unlike other manufacturers, Milltek does not use a lesser stainless. Everything Milltek makes is of high quality stainless steel. For over 31 years, Milltek has been developing exhaust systems, and that experience is behind all of their performance parts development. They are a preferred choice since they deliver power and sound advantages that are durable. They pay very close attention to details and, like us, are run and owned by those who love cars. We do not carry any parts that we have not put on our own cars. We only sell brands that we believe in and use ourselves. We offer a range of OEM Audi A4 parts and offer fast shipping with same day fulfillment in most cases. Our no hassle return policy makes it easy to order from us. Order your new high flow catalytic converter today.