The rear air spoilers have been out for over 25 + years- First designed to keep dust build-up from the rear window of a stationwagon- or a Blazer type of vehicle.
Watching the video- I guess it may cause some dirt blowing up from the bed of the RZR as it forces wind down as your speed increases.
Putting a rear window on hinders the Air spoiler mounting- but then again a rear window provides a better barrier from the dust getting sucked back in from behind--
something to think about
I never saw the point of having something like this on my xp. If I wanted to stay clean, I wouldnt drive offroad. I certainly cant justify paying that kind of money for a "spoiler"...maybe it's just me but when I ride in the dirt, I expect to get dirty.
I just bought some parts from a guy that has this spoiler on his 800 and loves it he said it keeps his gear dirt free.I hadn't seen one before he said it also helped with keeping the dust out of the cab area.
post is from 2014 but I looked up this part because the guy loved it and found the thread.It actually does add 10 hp I read it on the internet so it's true!