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They list Relentless RPM in Port Charlotte and they have been closed for years. I get the impression that their website just shows a list of locations that were once authorized to sell their product.
I may end up just rolling the dice on one of the names on their map, but I am hoping that there is one that has experience with tuning cars for the track (as apposed to "dyno-queens") and stands out as doing good work.
There are a couple of old Z owners that tak about ART?? ART performance? I also think there is a good one in Tampa. I know helpful... I plan on taking my car to Z1 in GA here soon.