What is this? Options

[freddy121389]

if you look at the picture im trying to figure out what is the thing attached onto the right side of the intercooler with the rubber hose coming out of it?

[blu94gt]

Yep, bypass valve. Take it from me, DO NOT get a vent-to-air blowoff valve. I had a TurboXS RFL valve on my WRX when I bought it and it make the car run like crap. Between shifts the car would be injecting fuel for air that was vented, so it would run rich. Switching back to the stock valve made it drive better and get better mileage.

Couldn't you just recirc the BOV then?

Some of them are made so they can be recirc'd. My friend had a Greddy on his STi that was a recirc. My TurboXS was literally just the valve with a big horn on it, and it came with a cap to close up the recirc hose. I guess I should have said if you go with a BOV, get a recirc one. Most of the ones I've seen out there are just vents though.