Forge Motorsport Audi RS6 C7 Recirculating Valves. We recommend servicing your valve every 3 years, or 20,000 miles, whichever comes sooner. A Pair of Forge Motorsport Recirculating valves for the Audi RS6 C7.This set comprises a pair of our solenoid operated valves together with a custom made wiring harness, that integrates seamlessly with the OEM electronics and results in absolutely no fault codes, no check engine lights, and no detriment to the performance of the vehicle in any way. They are engineered to remedy the failure issues experienced with the OEM solenoid valves when their diaphragm may rupture which would effectively result in a boost leak. Our valve uses full billet alloy construction with a piston based internal design that provides for significantly improved reliability over the OEM valves along with lightning fast response. Mods4U is a small family run business who have been working within the modified car parts scene for some time. We are a small business and as such there may be occasions when we are unable to fulfil the order due to issue out of our control so please bear with us!