What do you know about hypertech performance chips?

[AlaskanJack]

Someone has a hypertech performance chip for sale but doesn't know the chip code just that it came out of a ranger or explorer 4.0. The part number is 648711. I can't find a link to check this out any ideas?

 

[AgExplorer]

Hypertech will only give you added performance at WOT. If you're looking for an overall performance increase from a chip, check out Superchip.