Edmunds.com says your car is worth 14k trade-in, 15k private party. Thats before your mods.
Honestly, I'd ask 17k for it. Be willing to drop down to 16k. It won't be easy to sell for that price, because there is a smaller market segment who will buy modded cars. Still, if someone is looking for a car with some mods already done, they'll think that is a fair price.
BTW... you might want to consider parting-out. It'll be a HUGE pain with the amount of stuff on that car, but you'll end up ahead.