• Goes between the air injection tubes and valves (see pics).
• Prevents exhaust leak and backflow into air pump.
• Does not trigger any CEL / MIL.
• Fits Air Injection Valves from the following Subaru models:
• 2006 - 2014 WRX
• 2007 - 2021 STI
• 2006 - 2009 Legacy GT
• 2006 - 2013 Forester XT
• Appropriate uses of this kit include:
• Swapping an engine into a non-air-pump car.
• Kit car applications.
• Aviation and boating applications.
• Racing / off-road applications (unregistered & never street-driven).
• CNC-made in USA from 6061 aluminum.
• Includes genuine Subaru gaskets - 14719AA033. 
• Reuses the OE hardware.

Not intended for Subaru WRX or STI air pump delete or disabling purposes !