I looked at the on line tools available selecting private seller, excellent condition, 6,000 miles, and using an Indiana zip code:

Kelly Blue Book: $10,076
National Auto Dealer Association (NADA): $8,047
Edmunds: $9,886

The air bag cost to repair would be value consideration.
Many buyers do not fully value car modifications into the purchase price.
This forum is the best place to find a buyer that appreciates the car and the modifications done to it.