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As gutty said, make sure they're not VIN locked to a truck already. Superchips will unlock it if you buy a used one, but I'm not sure how much it costs, $20 maybe?
Both have "assured" me that they are unlocked and returned to stock. Really only one way to know. On that note, if I buy the inTune from the craigslist guy, will it take a lot of time to connect it to my vehicle and see if it works? Fuctionality and Lock/Unlock wise?