Scope of delivery: - Y-pipe ø 76mm stainless steel with interlock flex pipe with 100-cell racing cat for Audi/VW 1.8T 150HP and 180HP with transversely-mounted engines and front-wheel drive(Connection to exhaust in 76mm or with reduction sleeve to original 55mm, please specify when ordering) - incl. gasket set 2x gasket, 3x bolts, nuts and washers Description: *improved quality*The stainless steel ø 76mm downpipe significantly reduces back pressure, relieves the turbo which in turn brings more power, torque and lower exhaust gas temperature. The post-cat sensor may need to be programmed out. The Y-pipe is made of stainless steel except for the flanges, which are made of steel so they do not warp and thus prevent leaks. The flange surfaces are machined. 2 lambda sensor ports M18x1.5mm are welded in. The 100 cell cat has a diameter of ø 120mm. The Y-pipe sits between turbocharger and exhaust system. The connection to the exhaust is as original. Power up to max. 400HP can be achieved; however, of course, other components such as exhaust system, injectors, manifold, intercooler, turbocharger must also be installed and the software adapted. Upgrade turbochargers such as K04-001 plug & play also fit the downpipe.suitable for: - Audi TT 180HP (8N) - Audi A3 150HP-180HP (8L) - Seat Leon 1M1 1.8T 180HP FWD - Seat Ibiza 6L FR 1.8T 150HP - Seat Ibiza 6L Cupra 1.8T 180HP - Skoda Octavia I 1.8T 1u 150-180HP - VW Golf 4 150HP-180HPupgrade Turbo K04-001, K04-001 large compressor wheel - only suitable for vehicles with front-wheel drive and transversely-mounted enginesRegistration: For an individual approval according to §21 StVZO, please ask your TÜV inspector.We would like to point out that installation of this item constitutes a modification that invalidates the vehicle’s operating license in accordance with the StVZO. Not permitted for use on public roads.