All proven brands are reliable; as long as you are running the recommended maps and not going with a map too aggressive for your mods or fueling, you are safe. If that were not the case, the forums would be filled with complaints about damaged engines.
bootmod3 is the most popular flash tune, with many features, maps, and updates. Its also the most user friendly in my opinion as you can easily make changes on your own, all for free without having to wait or pay your tuner
JB4 is the most popular piggyback. Similar to Bootmod3, it offers the most user-friendly features, allowing the customer to make changes.
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