it came with a cap:) you can use any kind of cap i believe it 3/4 inch

Here's my HKS SS bov in stock location.



I replaced my stock airbox with some k/n filters, so I didn't have to plug the open hole in the box. But, before I had my k/n filters, I just used a rubber chair foot thing. It's just a rubber cap I put on top of the opening. Works well.



http://www.imagestation.com/picture/...c.jpg.orig.jpg

A soda bottle cap works nicely.



https://www.nopistons.com/forums/pub...DIR#>/wink.png

To install the BOV, did you have to get an adapter plate?

You need the 3rd generation FD specific flange.

So a FD specific BOV would be a direct fitment to the stock one without anything else?

Yeah, your FD specific flange will attach onto your after market bov, and will just hook up to ur stock rubber tubing.

How does that HKS ss sound? Is it louder than venting the stock bov?