Scope of delivery:- Y-pipe downpipe for Audi A4 B6, A6 C5 1.8T, Quattro ø 76mm 3" made of stainless steel (from turbo) with 200 cells sports catalytic converterDescription: - The two-piece Y-pipe sits between the turbocharger and the exhaust system. It also replaces the original catalytic converter and has a cross-section of 76mm (original 54mm), an Interlook flex pipe, holder and lambda probe connection are installed. The larger downpipe reduces the back pressure, relieves the turbo and allows more power to be delivered, up to 450hp depending on the components installed.suitable for: - Audi A4 B6 1.8T Quattro 150hp, 163hp, 190hp AVJ, BFB, BEX - Audi A6 C5 1.8T Quattro 150hp AEB, APU, ANB, AWT, ARKand also for the following upgrade turbochargers: - Borgwarner K04-015 53049880015 - Borgwarner K04-015 / K06 - Borgwarner K04-015 / TFSI compressor wheelRegistration: We would like to point out that installing this article constitutes a modification which invalidates the vehicle's operating license in accordance with the StVZO. Not permitted for use on public roads.