make sure you put a siphon break from KMS on your Rhino, this prevents oil loss, because the higher your RPMs the more oil comes out from that vent tube into your airbox,... the siphon break lets the oil fill up into this bottle and then it drops back down into the motor...
I just read what I typed and its a HORRIBLE explanation. Just cal KMS and they will tell you what it does. But basically it will save your motor, I know 2 people personally that have run without the airbox and the oil from the motor came all out through this vent tube and caused the motor to seize.
Put on a billet exhaust tip (removed the stock one) and you should see an increase in speed. Heck, just take it off and test it, if your speed doesnt increase put it back on.