EFI x2. Got delivered yesterday. The more I read up on the Sniper the more things it can do. I could've saved a lot of money on things if I could've bought this a long time ago. This will replace a lot of stuff. It's basically a computer controlled carb that has visual feedback. Kind of a carb tuning for dummies but it does a lot of other things too. Like control fan operation or timing. Probably some other stuff too. Also as new tech comes along they have updated free downloads to the software. Probably start the install Labor Day weekend.