Join Date: Jan 2009
Location: Dickinson, TX
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Im pretty sure that "custom" referrs to the chip being burnt for your particular mods... So if you have a set of injectors and upgraded HPOP, or any other mods particular to your truck, he can burn you a chip to take more advantage of those mods.
A off the shelf unit is designed for a wide array of truck, and with each truck being different, the tune set in that programmer is going to be good for one truck, but will lack in others..
1997 F-250 XLT Extended Cab LWB 4x4