Blow Off Valve S Diverter Turbo BOV Boost With Filter Fit For VW GTI Jetta Passat Fit For Audi A4 A6TT 1.8T 2.7TT. OEM NO. : 3022784. Fully recirculating valve design accurately directs all turbo pressure back into intake system, taking full advantage of your turbo system. The blow off valve adapter delivers a satisfying atmospheric blow-off valve sound and boosts turbo engine functionality. The Turbocharger bypass diverter valve combines plastic and metal materials, offering wear resistance and anti-deformation properties for prolonged use., Manufacturer: HGDDBAE