I've got a 99 YZ400 that I need an oversize fuel tank for this summer when I take a trip to Colorado. It looks like the IMS tank holds the fuel lower whereas the Clarke tank simply humps up in front of the seat. Anyone have any experience with either of these units. I'd also prefer something in the 2.8 gallon range rather than the 3.3 those units go at. If there's something better out there, I'd like to know.