I have a brand new Forge bov that I used for less than a week. Includes all 4 different springs and spacers. Direct fit for 02+ WRX's/STi's. The bov is chrome. My car idles perfect with it. $140 plus shipping, I live in Mankato, so you can pick it up if you wish.
Just out of curiosity, wich one? http://www.forgemotorsport.co.uk/content.asp?cat=1602&catalog=1602DV&inc=product