Hi DJImpact,
are you returning the truck to stock or selling it with the mods?
I agree with 84 Fiero, the mods may work against you, as most people do not modify their cars.
You may want to consider taking the amp and sub box out of the cargo area.
NADA shows a trade-in of $14,075 with the expected 80k to 90k miles.
Take care, Eggert
