The problem is not the place you are taking it to its how anyone values them.
While your modifications make it worth more in your eyes in a dealer or carmax eyes it reduces the value because that is something they have to return to stock.
Also they base it on the model such as I have an se model.
Even though it has all things upgraded to what the ses came with and more it is still an se to them.
Truth is modifications kill your resell value unless you find some kid whos parents have alot of cash to drop and are stupid, otherwise they would probably just buy him a new car.
The local ford dealer received my inquiry from intelliprice and hey told me I could get a 2013 SE for $17.5k but my car is still only worth 8375-11105 to them. I will drive this car until it dies even when I do purchase an additional car. Its not worth trading in for what you will receive for it.