I think there's much more to it then that.
The fact that he isn't forth coming in the ad about the brand of the kit, or any of the components does not instill confidence that it was actually a big money/quality build worth what he's asking.
"From the outside looking in" with the info he's provided, he is asking $15,000 for a work truck with a $2000 turbo kit.
1999-06 Chevy/GMC 1500 / 2500 Silverado & Sierra Truck Single Turbo System | On3Performance