I went with the IMS 3.4 gallon tank primarily because it has the largest capacity I could find of any of the aftermarket tanks and still be rider friendly. (Please don't reply ".....but Acerbis makes a 12 gallon tank that they made fer Dakar.") After installing it I was concerned how close the fuel transfer line ( The IMS tank comes with two 90 degree fittings that screw into the lowest part of the tank on each side. A fuel line is then connected between these two fittings so the fuel on the right side of the tank can move to left hand side where the petcock is.) was to the exhaust pipe. I ain't too book smart but I is smart enought to figger out that gas and hot exhaust pipes should be kept far apart. I e-mailed IMS questioning the supplied fuel lines and if they could withstand being so close to the exhaust pipe. They replied the fuel lines were high quality and not to worry. I gave it a test run around the neighborhood with a small amount of gas in the tank and to my surprise it worked. I took my bike out today to do a race in the So Cal dez and wouldn't ya know it, after fifteen minutes of warming up/ puttin' around camp the fuel line above the exhaust pipe bursts and 3.4 gallons of high octane dump on my red hot exhaust pipe. I thought my bike was done for but thankfully it was pretty cool out and I had about a gallon of water on my bumper and dumped it out on the header pipe. If anyone is planning on buying an IMS tank-please be careful and invest in an asbestos riding suit. Or better yet, go with the Clarke tank.