I've been looking at a few installation guides for my Blitz BOV that was fitted on the car when I got it. All of the guides say that I need to have the vacuum pipe fitted on the BOV, however my one doesn't have that hose fitted. It still seems to vent to air fine when releasing the throttle while on boost, but I'm wondering if I should fit the vacuum hose to it and if it will do any damage?
Picture of BOV so you can see what I mean: