I don't see them on the boots, but they've been there on the ones I've installed. It's a small diameter plastic hose nipple that connects to a vacuum-line size rubber tube that goes to a common vent point as I recollect.

good luck

 

Ok, I'll just have to get underneath and take a better look. It makes sense that it would need a breather.

 

Best I can tell they dropped the tube on the 6th gen v6's.....you can clearly see it listed on 5th gen's