Your asking price is too high, that's why you're not selling it. Only way you're going to recoup any value is if you part out the car seperately and sell the car as stock. It's the only way I was able to sell my car and get what I wanted for it.
A 60K 99 SVT is worth around $10K or so.. List it for that in stock condition, and you'll probably sell the car. Then sell the rims, stereo, etc seperately, and you'll probably get another $3-4K if you're lucky. But the chances of finding someone willing to drop $14-15K for a car modded exactly as yours is done up is harder.
Honestly, given the current selling prices, I'd say your car is worth around $14K in it's current state.
