Polaris has missed the mark on the RZR with the intake system and it has been catastrophic for many owners, my father in law being one of those. He has been through two engine rebuilds in under 800 miles, not typical of any Polaris machine. They mostly ave problems out west but anyone is at risk. The main problem is the way the chose to connect the filter, it does not stop all the dust from entering the motor causing a build up in the throttle body and what ever doesn’t stick there goes straight into the motor!!!!! There are many fixes that work well for different riding styles (mud, sand, desert silt,ect.) This is how I chose to relsove it for the type of riding we do, desert, sand, mountain trails.
I went with a KMS Performance intake I have logged just over 600 miles with this system and have had NO DUST intrusion at all. I have been very happy with the result.
Here is a link to purchase it. I am not affiliated with this company but they have it!
http://unleashedutv.com/catalog/product_info.php?cPath=37&products_id=209&osCsid=0e6763454a1c72baa1f44fdd49984ed1
I also purchased a HOLZ Racing Products engine air vent kit to help pre filter but I have not installed it yet. Here is a link to that product also:<

Dust intrusion from the first 120 miles pre KMS intake:

Back of air box flange cut off to allow the KMS billet flange to be installed:

KMS intake flange installed I used a bead of silicone underneath it to seal it to the airbox:

Backside view bolted up, this provide a better clamping surface area:

I changed the weak worm clamps for Stainless steel hose clamps on the intake boot:

Loaded the K&N with Outerwear and clamped it to the flange and put the air box back on:

over all KMS Performance did a great job designing this product and it works great, I a very happy that i bought it!
click here to see more picture of the install<