I think piggybacks are used mostly to cut costs with turbo kits & are a cheaper alternative to stand alones. They have limited number of uses... mostly to change ignition and fuel curves.
Stand alones are top-o-the-line systems and cost that much because they do so many things, as well as replace the stock ecu.
I'm pretty sure these are the reasons for each. I don't dabble very much in these sorts of things so if anyone can verify or correct me it'd be greatly appreciated.
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06 Flint Mica
~Current mods: Mod Express 6000k HID, TWM Performance shifter bushings, Eibach Sportline springs 
~ Waiting on: Tokico Blues, strut bars, TRD Sway bar, Enkei RPF1 Special Edition Black 
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