While it's running, take the screw out of the vacuum hose and watch the inside of the hks bov, when you plug in the hose does the valve inside move?
If it does move and not return, the seals have let go hence it leaking.
Alot of the *insert brand name here* STYLE bovs do this also so it is recommended to get genuine.
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Please use the forum to ask your questions as they will get replied to much faster than pming me 
Pics of my build.
"Good girls are just bad girls that don't get caught"
Do a diagnostic first!
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