I recently picked up a 2003 WR450. The owner's manual claims the tank holds 2.64 gallons. I plan on keeping 17s on it most of the time, and would like to have a bit longer of a range than I expect with that little gas. Is there a tank available around 3.5 gallons? I don't want anything too enormous, just moderately larger. I'm fine with replacing shrouds if I have to.