OBD2 has nothing to do with NAV. You need to change something in the NAV software. If you dont know what "cable" you are looking for, its probably best to do more research. You could do alot of damage if you dont know what you are doing. Are you taking about ECU reprogramming?
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2002 Subaru Impreza WRX Wagon
2004 MDX Touring - Midnight Blue Pearl