Jeep grand Cherokee programmer, or chip?

As i start doing modifications for my car i came across the uses of programmers, and performance chips. Do either of these really give your car a performance boost, and how much?



I have a 2002 grand jeep Cherokee 4 liter 6 cylinder.



I have heard the best programmer for this car is Superchips Power Programmer - Flashpaq



I also heard the best chip for this car is Jet Chips Performance Module and ChipJeep grand Cherokee programmer, or chip?
First thing u need to learn u don't have a car u have a jeep.Jeep grand Cherokee programmer, or chip?
second thing to learn is not to try to hop up a straight six. just take care of it, plugs wires...

jp cycles