You know, Ty Davis fame to glory on his tanks are that they are custom designed by him, mfg by IMS, with the idea to keep the width of the tank as close to stock as possible while placing the additional fuel to the lower portions of the tank. He went so far with the KX-500 that he designed a custom pipe, mfg by Flow, to replace the stock 500 pipe and that's where the additional gallon goes. I ran this bike with both stock and Ty Davis, forth and back (keep in mind, it's impossible to go back and forth), and I could not tell the difference other than the Ty Davis tank is slightly higher than stock. I love it. I still can't get the range out of my bike that other's on this site claim. So far, I can get about 70 miles on a moderate run. I wish I could get more, but even on the Baja rides, that's plenty. I carry 2 litres in my backpack so that extends the range about 13 miles. I've done everything from gearing changes, torque spacers, power now, reed valve, racing fuel, forth and back. And I can't get the range up.. Oh well.... Maybe I should slow down !!