Mounting it above the roof line will not hurt at all. I did ask S&B about the water question. I was told when you are driving the separator will get the water out just like the dust. Now mine is at the roof line so if I have mine on my open trailer and driving through rain I do need to cover the intake of the separator. Water can get to the air filter box.I am running the separator just below the roof line on my xp1000 in heavy az dust and I am getting fine dust on the filter and the inside of the filter housing. I am wondering if mounting the unit on top above the roof line will help or hurt. I have a full windshield and back Polaris net which is cut out for the front of the separator. Has anyone changed to the top of the roof. I worry about hitting low branches. The inside of my cab gets full of dust so I wear a helmet blower.
I have the Polaris metal roof that slopes up in the back, did you have to cut the roof to mount the unit up high.
Forgot to add what happens if the unit is mounted above the roof and it rains, does the filter get wet?
S&B does sell an extension to be able to not have to cut any part of your roof. As far as leaves getting into the unit I am sure it could happen but it is nothing I'm worried about. If I am riding where there are a lot of low hanging limbs 1. I'm driving slow 2. If leaves did make it into the unit it would take A LOT of crap getting into the separator to cause any air issues. Also easy to clean out the unit if some leaves did find their way in.
Bottom line for me is any draw back the separator might have the benefits are just so far superior for what it does for my machine.