you need some way to notify the state that the vehicle has been sold. I recently sold an audi, the tool didn't register it and kept driving it, and 90 days later i had an impound lot on my ass for storage fees and to come get my vehicle. They would not release it to the gentlemen that bought the car because the officer confiscated the title. Once he retreived the title he was allowed to get the vehicle out. Case in point, without the title i would have been liable for towing/storage fees if he didn't want the car anymore.

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83 300SD.......sold
96 integra SE....sold
99 a4 quattro....sold
2001 IS300.......sold
2002 330i.........current.
2004 highlander limited....current.