For VW Golf/Jetta GT17 Diesel Turbocharger w/Manifold & Wastegate Turbine A/R .61 + 30 psi Boost Controller (Red) Increase Engine Power and Torque Outpout; Maintain Combustion Chamber Pressure and Fuel/Air Load Contructed with High Quality Material; Built for Durability and Strength; 20 psi Efficient Torque Turbocharger; Internal Wastegate Setting: 8 psi Capable of Boosting Horsepower up to 300+ BHP / Exhaust (Turbo Manifold) Flange: Standard Volkswagen K04 3-Bolt / Exhaust (Downpipe) Flange: Standard GT1749V/ GT1749VA/ GT1749VB 3-Bolt Inlet/Outlet: 1.625"/1.1875" / Compressor Inducer: 48.5mm / Turbine Exducer: 48.9mm / Turbine A/R: .61 Boost Controller: Made of Aluminum, Adjustable 1-30 psi