Milltek Downpipes Large Bore with High Flow Cats Audi S6 / S7 (C7) RS7 4.0T (use w/OE Exhaust)

Improve performance and sound for your (C7) Audi S6, S7 and RS7 4.0T with this downpipe system from Milltek which features a 3" aircraft grade stainless steel tubing that, also includes a 100 cell high flow catalytic converter that connects directly to the stock turbocharger. This downpipe will deliver extra performance and a greatly increased turbo response over a factory restrictive downpipe. This downpipe is designed to be used with Milltek's 3" cat-back exhausts, but may also work with other brands which may require fabrication.Note: Must be fitted with factory OE Exhaust System. Requires stage 2 ECU remap and oxygen sensor extension leads.