I am looking into buying a left over 07 420 rancher from the local dealer. I race quad MX and have 2 450Rs right now. Im keeping my race quad but the girl is not likin trail riding on the back of my other 450 so im thinking of buying a UTE for a spare. My question is since i am used to a full built 450 of course i am gonna wanna have a little extra power but dont need alot, and dont wanna buy a Rubi or Rincon due to i spend enough money on my race quad every week. So what kind of mods can i do to the 420 to pump it up a bit. Do they have a box and exhaust that will really liven these things up??