Scope of delivery: - Y-pipe / downpipe for Audi A4 B7 2.0 TFSI Quattro ø 63.5mm from catalytic converterDescription: - The Y-pipe sits between the catalytic converter and exhaust system. It is screwed onto the original catalytic converter. It has a cross-section of 63.5mm. The larger downpipe reduces back pressure, relieves the turbo, and allows more power to be delivered—depending on the components installed, up to 350 hp. To get to the original exhaust system, a reduction sleeve of 63>54mm must be used, but usually larger exhaust systems are used for tuning, and then the pipe cross-section should not be tapered.suitable for: - Audi A4 B7 2.0 TFSI QuattroOptional parts: - Matching 200 cell sports cat 340111Registration: For an individual approval according to §21 StVZO, please ask your TÜV inspector.We would like to point out that the installation of this item constitutes a modification that invalidates the vehicle's operating license according to StVZO. Not permitted for use on public roads.