Have you moved your air filter from between the seats yet ? As you may well know Yamaha moved the filter on the '08 & newer Rhino's...Here's a pic how I moved my K&N air intake under the hood...filter stays much cleaner/longer now...the 2.5" hose is pricey @ $8/foot...but its well worth the effort & cost...

I definitely need to do that! What all is involved?

You can buy the 2.5" tubing from 'House of Hose' in Orem....or any NAPA store...this is approx a 2hr job....biggest PIA is running the tubing from carb down through the drive line tunnel on the floor & under the hood...then weld a muffler clamp bottom to the frame as shown in pic to mount the filter...or if you use a factory airbox...figure a way to mount it...you'll need about eight feet of the tubing....zip ties to secure the tubing from moving...you may also need to play with the carb jetting afterwards...I'm running a 147.5 main...runs strong up to 11K'.....