I was looking to buy a performance chip from jetchip.com and they offer a few different things. my question is should i get all these parts or will one thing do all of them? The parts are: Jet ford mudule(auto transmission), performance programmer, and the power shift. If you go the website and put in 1998 mustang GT amd look at the descriptions they look like they kinda overlap each other in the sense that they all work on similar things. so if anybody can clear this up for me it would be greatly appreciated.