The GFB Respons T9009 is specifically designed to solve the BOV fitment issue that arises when upgrading the intercooler on Subaru Forester XT MY03-04 models. It is a common modification to use the intercooler from the MY01-05 WRX, but because the BOV flange is different, and the location of the recirc hose must remain the same, neither factory valve from the Forester or the WRX can be used, or other aftermarket valves for that matter. The T9009 bridges this gap by keeping the recirc outlet where it needs to be on the Forester, whilst having the triangular-shaped mounting flange to suit the upgraded intercooler.