Features: 1.Wide Applications: The throttle body spacer is replacement for STI 2004+ and replacement for Forester XT 2004?2008. 2.More Power: Can creat more intake manifold volume along with a better air fuel mixture you will make more power and get better fuel economy. 3.Professional Processing: CNC Machined from 6061 Billet Aluminum, the throttle body spacer has hard anodized finish, which is perfect fitting. 4.Practical Function: The throttle body spacer is designed to increase horsepower and torque, which allows rotating the throttle body and alternator clearance. 5.Standard Size: The spacer has 2 1/8in NPT and 19mm thick threaded portts, which can be used for vacuum, boost source. 6.Universal: Suitable for those flipping or reversing the intake manifold and also can be used in the cosworth manifold. Specification: Item Type: Throttle Body Spacer_x000D_ Material: 6061-T6 Billet Aluminum_x000D_ Fitment:_x000D_ Replacement for STI 2004+_x000D_ Replacement for WRX 2006-2014 _x000D_ Replacement for GT 2005-2009 _x000D_ Replacement for Forester XT 2004-2008 _x000D_ Replacement for Impreza 2005-2014