I suppose it depends on what sort of inputs you need to data log. I've been using the 3 channels of data logging capability that are built into the Holley Sniper EFI setup. They are pressure only channels on the Sniper so I'm limited to things such as fuel pressure, oil pressure, transmission pressure, pan vacuum, brake pressure, PS pressure, etc. If you want temp and velocity inputs then you have to step up to something else.