a lot of us have it and are very happy with it. i love mine, the shifts are better and more abrupt. using with a lower t-stat the adjustable fan speeds are great. i barely cracked the surface with mine, just using the canned tune, but if you are going to get a custom tune, in the hands of the right person, its quite the amazing tool.
just be aware, its not a chip. its a small hand-held tuner a little bigger than a Gameboy that plugs into your OBDII port under the dash, uploads the tune, and then you disconnect it.
there is no chip, unless you mean the B&G mail in tune. but at this point, B&G is working with Diablo to do tunes for the Predator. other than that, there is no chip.
i THINK there are people out there who have a Jet chip, but i also am pretty sure thats regarded as useless.
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