For Audi A4 / VW Passat 1.8T Upgrade F21L Turbocharger. For Turbo Part Number. For Turbo OE Number. Inconel 713C alloy steel Turbine rotor. 42CrMo High-strength rotor shaft. 360 alloy Thrust Bearing. Customizable “high-lift” actuator (5psi – 10psi). 26mm wastegate chamber with oversized 34mm cover. Si-Mo cast iron turbine housing (1000 c). All parts and Product assembly Performed To OEM specs by OEM suppliers. Upgraded K04-015X Audi A4/ Passat 1.8T. Upgrade for 1.8T from the K03 and Larger than k04-015. XL 46.4/62 mm Billet Compressor Wheel. This is 275+WHP capable! Audi A6 1,8T (C5) 1997- year 180HP AJL. Audi A6 1,8T (C5) 1998 year 150HP APU/ARK.