This is my first orv. I purchased a 2006 rhino 660 without knowing a damn thing about them. I plan on just running around my property in AZ. And maybe through the desert near there. Not looking for performance looking for reliability. I want to do the basic maintenance at home before I drop it off at the ranch but I am confused. Wanted to change the air filter and it seems to have no air box? Guess PO modified it. Would it be better to change it back or just replace the current K&m filter. TIA lots of questions to follow.