Over time the stock bypass valve can simply lose its capability to hold boost, especially if you are running increased boost over stock settings. Most people go with an aftermarket adjustable BOV, whether open loop or recirculating like the stock unit. But if you are still running the stock valve and are hearing the "hooting owl", it's time to replace or upgrade that tired stock valve. We offer a variety of aftermarket valves to satisfy whatever your heart's desire is, but sometimes the almighty wallet rules! The stock valve is definitely the most affordable option.
Left = 1st Gen 91-93 Straight Outlets | Right = 2nd Gen 94-99 Offset Outlets Lower pic is approx orientation as installed on car, looking from pass side.
NOTE: The 94-99 BOV is special order from Japan and can take up to 90 days to arrive.
NOTE: This listing is for a BRAND NEW OEM valve (though used are pictured).