By Law they have to give you replacement value for your car in your area. To get a good idea of what your looking at is to check the on line auto trader and see what the dealers are getting for the equivalent of your car, mileage, condition, color, and model. also they will include the tax license and registration fees. As far as the after market parts, they let me take my parts off and reinstall the factory ones. actually they told me to just put the parts in the cab of the car so I did that, remember they own the car at that point so don't create more damage to the car by removal your parts.