The kenne bell kit for the 5.0 doesnt come with a tune from KB. Those are the kits they let you get an aftermarket tune because there are so many different combos for them. Running without a tune, there like a 50/50 chance of either the car running good, or it running like crap. I think your best option would be to choose a place to work with, and a "combo" from them, with a chip that would best match it.