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I've heard that these things are super effective in increasing performance and gas mileage. Does anyone on here have one? I would like to program mine and see what difference it makes. I would be willing to pay all shipping and a small usage charge...99 Tahoe 5.7L of course. later.

This is my first post on the site by the way and my first day as a member :) ...I just purchased a 99 2 door tahoe LT, 4wd, loaded out, 120k, Pewter in color. Just like all the other tahoes I was looking at, the headlights are all faded and are in need of replacement. I found a set up on...