FAST ECU Basic Kit FAST LS1/LS6FAST's Transplant Kits have taken all the guess work out of fitting a crate or junkyard engine into your project. Our kits contain everything you need to transplant your LS1 or LS6 design engine without needing to modify a factory harness or tune a factory ECU for your custom application. Your project deserves a kit that was crafted by fellow gearheads who know what it takes to swap an engine. This LS1 LS6 kit contains our XFI 2. 0 ECU, XIM ignition