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From what I've read in other forums so far, chips are not the way to go. You should buy a power programmer. Apparently the chips lose contact over time and start to cause all sorts of problems. Everyone says that the power programmers are the way to go since they just reflash the factory computer and don't rely on electrical contacts that go bad.
How can the 6-pos chip vibrate loose when you get it stuck right?
Try DP-Tuner and see what he can do for you. Go buy Superchips first and see if you like that. Then the DP-Tuner will make you kick yourself for wasting money.
I can't offer any opinion on the Superchip but the Banks Six Gun with Power PDA has been good to me. Guages and tuning ability in a compact package in which I added TomTom Nagivation. I guess it depends on what you want or need. I like some extra power and efficiencey, especially increased mileage. A lift kit and 37 inch tires tells me you may desire something else.