Scope of delivery: - Y-pipe downpipe for Audi S3 8L 209PS TT 225PS ø 76mm stainless steel with 200 cell sports catalytic converter E-mark possible up to Euro 4 (connection to exhaust 76mm) - incl. 3-hole seal, V-band clamp + exhaust clamp 76mmThe Y-pipe is located between the turbocharger and the exhaust system. The connection to the exhaust is maintained throughout at 76 mm. We offer a reducing sleeve (item 122517) for easy connection to the stock exhaust. This allows the downpipe to be installed plug & play.Description: The stainless steel ø 76 mm downpipe significantly reduces the back pressure, relieves the turbo, which in turn delivers more power, torque and lower exhaust gas temperature. The post-cat sensor may have to be programmed out. The Y-pipe is made of stainless steel except for the flanges, which are made of steel so that they do not warp and thus prevent leaks. The flange surfaces are machined and the V-band connection is male/female, thus self-sealing and self-centering. There are 2 lambda sensor connections M18x1.5mm and an interlock flex pipe welded in.The downpipe also fits upgrade turbochargers such as K04-023 plug & play. The downpipe can be replaced 1:1 by the original.The high-quality 200 cell sports catalytic converter has an E-mark with the E-number E9-103R-00.3083. This means that even with 500 hp, the Euro 4 emission standard can be achieved. (This requires consistent engine management/hardware and software).The homologation certificate for the catalytic converter for the E-number E9-103R-00.3083 is supplied. This allows official entry in the vehicle registration document in consultation with TÜV.suitable for: - Audi TT 1.8T 225PS Quattro (8N) - Audi S3 1.8T 209-225PS Quattro (8L) - Seat Leon Cupra R 1M (a 2-hole flange must be purchased for the exhaust and welded there)Registration: For individual approval in accordance with §21 StVZO, please ask your TÜV inspector.We would like to point out that the installation of this item constitutes a modification by which the vehicle's operating license under StVZO expires. Not permitted for use on public roads.