OK here is my .02 on tuners hand held or otherwise. For Fords I am a HUGE SCT fan. It helps my brother is a custom tuner, so I have good info on stuff..lol For GM HP Tuners is the way to go, SCT makes hand held tuners for Chevy if you constantly change your tune. SCT Also makes Dodge hand held tuners, not much EXP with those yet, not alot of call for it. I do not like "mail order" or generic tunes. Every vehicle is different and will react different. In the race car we run a FAST stand alone system. If you have tuner or tuning questions I would be happy to answer them to the best of my ability.