BTW - don't try this, it'll get you into trouble:
When you sell a car / buy a car sell it for "on paper" for "$100.00 bucks"
Thus when the person who bought the car goes to the DMV to title it,
they pay taxes on.. well...only a $100.00 bucks.
But know this, most US states have the police officer come outside
the DMV and check the VIN when the car is titled in a new state,
thus most folks get caught, because:
.. when they buy a car from another state, police check:
a) VIN is correct and not tampered with
b) that the car is really only worth $100.00
Thus some folks don't want to buy from another state for the above reason.
Crime don't pay folks.