my map was put in by chester sportscars where I got the system from then took it to my local rolling road for a tweek they messed with the jetting slightly but siad they didnt have to touch the map as it was spot on . I have heard that some of the maps off the internet are a bit off when it comes to set up rolling road I go to says they deal with them alot and usuallt finds that the downloaded maps are way off when it comes to it . my reccomendation would be give the guys at chester sportscars a call or drop them an e mail