How to determine the sale value of a modified Grand Prix?

[TurboKent]

Looking for input to determine what the sale value of my grand prix would be worth. I'm very dissapointed by the amount of money that is put into a car and never seems to be recooped at the sale, I know that the value of the car will lessen over the years as well as what has been modified. If I had to guess i would say the amount that i bought the car for plus all modifications i have invested around 25-26K. I'll try to list all of the modifications i can think of and i want you guys to give some input as to what the car is worth.
So here it goes...

2003 Grand Prix GT sedan KBB=around $7k
Cartuning turbo kit 62mm turbo, with intercooler
Fully built zzp trans with 3250 stall
Devils own alchol injection
Audio system= HU, 6.5 front speakers, Jl 12w6v2, jl 500/1, Dynamat on front doors and entire trunk
Lighting= Hid's headlights and fogs, Full led interior.
Suspension= Lowered, front and rear sway bars, BMR rear lateral and control arms

Those are the main things i can think of... will update later if needed, here is a page from car domain that has some good pictures my ride

 

[codyAK]

People generally don't go looking for modded cars, and you'll have a smaller audience when you're trying to sell.
You say it's $7k on KBB, I imagine you list at $7k and you'll be pressed to get it.

 

[matt5112]

That car is worth between 5-9 grand.

Mods mean nothing in terms of value and actually take away from it in some cases.

Part it out, sell the car stock and make most of your money back.

 

[Ibwrong]

^^ Would have to agree. You can get alot more if you just demod and sell the car stock.

 

[Spartan GL]

ditto on that. or just keep it