This blow off-valve is the best resec/atmosphere release valve that you will buy for a Subaru WRX/STi. This should work on a STi as well with no problems...I payed $300 when this product first came out. Price is $175.00.
About 1500 miles on it, excellent condition still.
Will accept paypal from only verified members, but would prefer WU/Money order/Secure wire transfer. Buyer pays for whichever shipping method they wish.
More information on it:
Agency Power Adj. Blow Off Valve Subaru WRX 02-07 STI 04+
Colors : (Black)
Please email for picture requests and I can take some.