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It came out to $216. They can either have you send in your PCM and they can tune it then send it back. Or you can buy a new PCM from them they will tune it and send it to you. To purcahse a PCM from them is $75. The way I did it was drove to the shop and they drive tune it. That way they can see how the truck responds to the tunes and can adjust accordingly. They were very helpful and were great to work with.
Nelson Performance = Crazy-ass ****'s! Some of the stuff they build is totally insane!
OP... Along with the better mileage, have you notice an increase in performance, too?