I have a 2002 Mustang GT with 73k miles the NADA value is $11,425 and I am asking $9,500 obo.I have it online everywhere and in all our local news papers. I have been trying to sell it for over 5 months now
Most potential buyers will be turned off by your custom tuning and changes to the car. It implies that you have also made other modifications and that maybe you didn't do a very good job. Your only potential customers will be the very few people who are looking for exactly the kind of mods that you've made. Keep advertising it and you'll eventually find that person.
I would suggest that you downplay the mods, especially if they don't dramatically change the way the car looks or runs. I sense that you think the mods are a big selling point, but it may be just the opposite.
First, its a gas eater nowadays and second, its consider a sports car because of its crazy hp on local roads. If you want to sell it fast like others, most people look for economy type of cars and sedan like. Since the economy is not so great at the moment. Maybe after the gas price lowers to near $3's then you can probably have a slight chance.
2002 wasn't a very good year for mustang, the wheels they used on the stock GT were ugly and the body has some awkward lines. Hold out for awhile if you can, see if gas prices go down. Your price is decent.