When selling a modified car, it is important to be clear about what you are selling. If you are selling a car that has been modified by a third party, such as a body shop, then you should be clear about what the modifications are and what they will do to the car. Additionally, be sure to list any special features that the car has that may not be available on regular cars. Finally, make sure to provide pictures of the car in its original condition so that potential buyers can see how it would look in person.