Thread: 328i N20 Tunes
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      11-12-2012, 04:39 PM   #40
bnekic
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Drives: 2013 328i xDrive Sport Line
Join Date: Oct 2012
Location: Cleveland, OH

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Piggyback is the JB Stage 1 from BMS. The unit they sell is called a piggyback since it plugs into various sensors in the engine bay and "piggybacks" off the factory ECU.

Piggybacks essentially trick the factory ECU with what data it's receiving to make more power.