Are you planning to use stacks? FAST EZ EFI 2.0 doesn't seem to work with stacks - you need to get another FAST system. I think it is the XFI Sportsman. I was told that FAST said EZ EFI 2.0 is the wrong computer for a stack system because it isn't really tunable like the Sportsman. I have the FAST EZ EFI 2.0 (no stack system), and my dyno guy couldn't tune it because there aren't many user-accessible tuning parameters. He even called his contact at FAST to confirm.