Staggolee is right, you want a tune went for your specfic mods and your driving tendancies. In addition to what stag said, once you use a tuner on your vehicle it stores your factory tune. That makes it locked. If you put your factory tune back on your car that makes it unlocked. That is to prevent me from buying the tuner and tunes, putting them on my car, then letting my friend use it on his car. You have to put your factory tune back on your car before you can let somebody else use it. If you purchase one from craigslist or other private seller you may end up getting a tuner that you can't even use.
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