No need for a BOV.. i was in the same position as u when i got my car and i got so many people telling me not to get one.
Instead i got an SPT Short Ram Intake, and got a great Wchsh from it. haha
If your not pleased with that little amound of noise that the intake gives you, do what i did and take out ur intake silencer which takes about 10 minutes, to find out how to do that, just search "intake silencer" on clubwrx.
Once i did that, i found out there was no need for a bov because i had the perfect WHCHSHHHHHH i wanted for my car
hope i was a help to u