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which tuner?

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This is likely going to be a heated debate, but I'm going to ask anyway. Which is the best chip/reflasher system out there and why? I realize it depends upon one's goal, so I imagine there probably isn't one that's best for everyone. All you folks out there who have had good and bad experiences with aftermarket tunes please share your experiences.

Thanks in advance.
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All the above posts are correct.
For automatics the X-Cal II wins hands down.
If you want to turn off the traction control or the rear O2 sensors the X-Cal II wins again.

Support of a local tuner is important.

With all that said I have a Diablosport Predator for my 5 Speed and I love it.
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