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'09 GT500 tuner

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I just swapped out the stock rear end for some 3.73 gears on my 2009 GT500. Very worthwhile modification !!

But now my speedo is off, way optimistic.

Does anyone have experience with what the best tuner would be that I could use to correct my gear ratio in the speedometer now as well as tuning upgrades later?

I see DiabloSport Predators, JLT, etc.


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