I recall writing a more thorough explanation concerning the differences between stand alone EMS and piggy backs and the different features of some of the more common ones, but I'm not having luck locating them. Here are threads with some of my old posts on this matter. The easiest way to find more is probably to search "tuning" or "MAFT"... specifying posts by me using the advanced search may help further.
http://www.toyota-supra.info/forums/...etter-now.html
http://www.toyota-supra.info/forums/...ore-power.html
About the MAFT Pro specifically:
http://www.toyota-supra.info/forums/74631-post6.html
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