Scope of delivery: - Y-pipe downpipe Quattro for Audi A3 TT 1.8T 180HP ø 76mm stainless steel with 200 cell racing catalytic converter.Description: The stainless steel ø 76mm downpipe significantly reduces back pressure, relieves the turbo, which in turn provides more power, torque, and lower exhaust gas temperature. The downstream 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. There are 2 lambda sensor ports M18x1.5mm welded in. The 200 cell catalytic converter has a diameter of ø 120mm. The Y-pipe sits between the turbocharger and exhaust system. The connection to the exhaust is as original. Power of up to max. 400HP can be achieved, of course, the other components such as exhaust system, injectors, manifold, intercooler, turbocharger must be installed and the software adjusted accordingly. Upgrade turbochargers such as K04-001 plug & play also fit the downpipe. suitable for: - Audi TT 1.8T 150-180HP Quattro (8N) - Audi A3 1.8T 150-180HP Quattro (8L) - Seat Leon 1M1 150-180HP all-wheel drive - Not for vehicles with front-wheel driveRegistration: For 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 which invalidates the vehicle's operating license according to the StVZO. Not permitted for use on public roads.