the way it works, buy predator.. download any updates for it. Talk to Hemifever and ask what pids to datalog. Plug diablo into truck, go to diagnostics (I think), choose the pids you need to datalog. Drive around while data logging. Then download that file and email it to Sean, he will make a tune for you and email it back. Then upload to predator and install into truck.. You can also connect it to a laptop while datalogging and then send it that way..