We use Alldata pro in our shop, and mitchel too, and it has been mostly accurate... 
We have the luxury of requesting updated data when we find an error which they will send to us within 20mins on average.
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Turn3 Autosport- Full Service and Race Prep
www.turn3autosport.com
997 S 4.0, Cayman S 3.8, Cayenne Turbo, Macan Turbo, 69 911, Mini R53 JCW , RADICAL SR3
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