heard a lot of feedbacks from BOV users.. These are what I've compiled
1. Blitz SuperSOund ( so far none has failed it's owners ) abt 6 of them I know using this kind of BOV
2. Greddy S-type ( the quietest aftermarket BOV I know of ) not bad .. none of the Greddy BOV I know off, failed the owner.
3. Monza (HKS SSQV Look-a-like) not too bad.. but may leak.. so far out of 4 users I've asked.. 2 of them experience leakage.
4. Apexi Twin Chamber. Not too bad.. but known to be leaky too.. and it's darn expensive for a new one. (I'm using this BOV) Mine is leaking when on high boost.. 1bar constant...
5. HKS SSVQ.. sounds very nice.. but known to leak at high boost too.
Therefore: If I were to rank the BOV for it's price and quality I would rate it this way
1. BLitZ
2. Greddy
3. HKS
4. Monza
5. Apexi