I have used Hypertech on the last 10 GM trucks/ SUV's.... Found them user friendly. I'm not a mech. found the plug and play to work well.. I had Granitelle (sp) MAss air sensoro on my 99 Sub before the Vortech was put on. Never got engine warning lights.. I think Any of the units you are looking at will do the job. I know the hypertech works. and am comfortable with it.. THe hypertech for my H2 came in toey while I was out. Will install this Sunday and will let everyone know if I have any problems with it.
Mike
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