0260B4U

Well just got the prototype in tonight will have vids available as soon as my friend gets the drivers for his camera

nvsprelude

thanks auwrx! i just installed the bov and i love it! thanks for the fast service! its pretty loud on the highest setting! easy install... oh yeah i got the stealth fx if anyone was concerned... sounds like the blitz kinda but cleaner... thanks again!

Sonic1

Well besides the fact that auwrx is a vendor and might just tell you anything to sell you a BOV (remember they are in sales)there are other things to consider:

A BOV works by detecting a vacuum condition on the engine side of the throttle butterfly and opens a valve to dump excess pressure back into the air intake of the turbo. As manifold vacuum decreases the BOV begins to close and is fully closed once there is positive pressure in the inlet manifold. The BOV prevents the back up of pressurized air and reduces the restriction on the turbo allowing it to free spin as much as possible.
Externally venting BOV's can present a false picture of engine operation to the ECU. When an externally venting BOV opens to the atmosphere the airflow meter sees a large increase in airflow that is not entering the engine. This can lead to an excessively rich mixture, backfiring and generally poor performance. This is why Subaru vents the BOV back into the air inlet system. BOV's do not control boost or increase horsepower, it purely a device designed to protect the turbo from dangerous backspin as well as improving off/on throttle performance.
Still the main purpose unless you have major engine buildup a BOV just makes the noise that you want to hear and there are a lot better thing to do with the money than spend it ona BOV for performance matters. Even the STI version of the WRX runs the same BOV as does the standard US version of the WRX.