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Just sharing what i did i had it with aftermarket BOV and i went back to my OEM WRX02 BPV but since i have a tomei arms turbo right now i was concern it might not hold the boost pressure and through research came across some materials stating a OEM BPV can be modified for it to handle a bit more pressure so i went ahead and modify my stock BPV .. this is similar to a Coto oem BPV .. Final result it was good i love the throttle response my car is not fully tuned yet but im running on speed density now. which i setup my BPV to be a BOV .. and venting out the boost it sounds weird its like a fart without the sound. so i experimented with hks ssqv fins installed on my modified oem wrx bov ( pls, see photos ) final result .... i love it ! i love the sounds it generates !

btw. you have to cut the two ear tab of the hks fin and install a washer inside ..but its a perfect fit to the BOV again just see photos below
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