Scope of delivery: - Downpipe for Audi A4 B7 2.0 TFSI FWD made of stainless steel with 200 cell sports catalytic converterDescription: - The Y-pipe sits between the turbo and the exhaust system. It is screwed to the original turbocharger and contains a 200 cell cat ø 120mm. It has a cross-section of 80mm in the upper area, two M18x1.5mm connections for the lambda probe and 63.5mm in the lower area, due to space restrictions. The larger downpipe lowers the back pressure, reduces the load on the turbo, and more power can be delivered, depending on the components installed, up to 350 hp. To match the original exhaust system, a 63>54mm reduction sleeve must be used, but usually, when tuning, largerexhaust systems are used.suitable for: - Audi A4 B7 2.0 TFSI FWDRegistration: For an individual approval according to §21 StVZO, please ask your TÜV inspector or our partner company Exclusive-Tuningparts e.K. at https://go-street-legal.com/eintragungsformular/We would like to point out that the installation of this article constitutes a modification which invalidates the vehicle's operating license in accordance with the StVZO. Not permitted for use on public roads.