Had over 40,000 miles on my first 6.4, it had a variety of beta test tunes back in the day and as for the things that broke, well it was my own fault, pushing the truck past its limits. I look at it a lot like using nitrous, if the set up is correct, pill size, timing, fuel, etc, etc.....then more times then not you're going to be fine, but don't kid yourself, you're almost doubling the power output of this truck, making it that much easier to "break" something.........just use your head and you'll be fine :thumb: