Ok so I'm putting on 35's (once i can finally find the right wheel in stock ) but i'm going to have to recalibrate my speedo. So what I'm wondering is, should i buy the jet speedo recalibrator for 140 or spend almost 325 for the Jet Programmer. I will not be using high grade fuel, only the cheapest there is, so is buying the programmer even worth it. I have a 03 v6 4.2l so that programmer is like the only one out there. Is it worth paying that much more? Is there that much of a difference felt?