Just got the BOV installed.. one question. The directions are in chinese, so i had to trash them. Anyway, when you first take the BOV out of the box, the side that bolts to the stub - do you have to remove anything from it or does it just bolt straight on? The reason I ask is because it looks like the bottom of the BOV is sealed up and no air could move through it. Also, what does the "adjustment ****" at the top of the valve do when you turn it? thanks