Oh and to further answer your question...mail order tunes are pretty worthless. Reason being is that they don't know your exact climate conditions so they can't tune for the EXACT temp, MAFS calibrations, and so on. Local tuners can tune your vehicle right there in your climate and actually see how your car takes to the new tune and make final adjustment to remove any KR, rich or lean conditions, and even advance or retard timing. They also have controll over your PE table so you can engage it sooner.