Fuelpak fuel management controller. This was on my 08 Kfx450r when I bought it. I changed my intake, and wanted to retune, so I bought a more simple fuel controller so I could tune it myself. I dont know much about these, except that they are to be used with a computer and dyno for maximum tuning. I imagine these are actually better for fine tuning if you have access to a dyno. $100 to your door. Continental u.s. only via Paypal.