Siphon break, got one on the racer and the wifes Rhino. Keeps things clean during extended runs. FYI, excessive blow by can indicate a worn top end on high mileage units.
CVT filter, ran one during the first 1000 miles of my wifes Rhino life, took it off because I got tired of cleaning it every ride, not everyday but every ride, they work good.
Reason people have problems is they dont get cleaned often enough, plug, then smoke the belt.
I did notice a difference in how dirty the clutch grease was between before the filter and after.