I've been able to drive my for 2 days now. Man I can't wait for an EFI LIve type program but for a truck that'll hit 850, I keep the programming up and just control the smoke with my foot. Easy to DD. Spools up and gets it on fast. and better yet, hand calculated 22 mpg with an 8" and 38's. Beats the hell out of me. I was about to give up and go with smaller turbo's...