This is a Perrin atmospheric Blow off valve that I used on my 2005 WRX for about a year until I sold it. Fits 2002-2005 WRX and STi models, it may fit 2006-2007 WRX models as well but you would need to do a quick google search on it. Item is perfect and sounds GREAT. You can manually adjust the spring inside for a softer or harder setting, asking $70. Cash pick up preferred as I really dont want to ship. Thanks for looking! I do have pics available upon request as well.