there is no need for an aftermarket bov at stock leval of boost other than the nice noise it makes. even at bpu the there are no benefits in fact besides the hks ss the other aftermarket bov tend to stall at low rpm they are relly designed for high boost applictions. See mkiv.com and for next to nothing you can do the Twin stock bov mod. It makes more noise than stock and flows twice as much as well and it will only cost you the price of some tubing and a used bov