For Audi A4/Quattro/VW Passat Turbocharger Turbine A/R .87-1.8 1.8T K03 EA113 B5 High Quality Material, Cast Housing with Durable Steel; Boost Engine Horsepower Significantly Increase Engine Power and Torque Outpout; Maintain Combustion Chamber Pressure and Fuel/Air Load Contructed with High Quality Material; Built for Durability and Strength Capable of Boosting Horsepower up to 250+ BHP; Exhaust (Turbo Manifold) Flange: Standard K03 3-Bolt Flange; Exhaust (Downpipe) Flange: 3-Bolt Flange Pattern Inlet / Outlet: 1.5" / 2.5"; Compressor Inducer: 33mm; Turbine Exducer: 45mm; Turbine A/R: .87