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Carbahn Tune Installed — HOLY SH*%
It would be a lot to explain.
Piggyback are hardware that plugs into a few sensors and alter/tricks the car's computer (ecu/dme) to get more hp. However the factory ecu parameters are not changed.
Bm3 is a software that reprograms the ecu to increase hp. Flash tune reprogram ecu - timing, boost, fuel etc).
There's tons of info on this forum and google on this subject. I would highly suggest you do some research and have a basic understanding of the 2 before diving in.
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