Hey Shawn found some info for you.
The 1g BOV may be crushed to allow it to hold more boost on the highend and to not leak at part throttle applications.

Crushing the BOV, in short, entails placing the BOV in a vice and slowly crushing it (making it shorter not skinnier).

The trick is to use a vacuum pump (hand is fine) and gauge and crushing the BOV until it remains closed at about 20 mmHg. So don't just stick it in a vice and crush it 0.x inches.

You have to use a vacuum gauge to do it right.

 

First bov I bought was crushed, didn’t sound that great and surged like a **** at low boost.