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It doesn't "Damage the ecu" it could blow up your motor. It is just a very stupid way to manage a fuel system, it is not controlling variables that NEED to be properly, accurately, and precisely controlled for an engine to run well and reliably. All a piggyback is doing is taking information, changing it, and sending it to the ECU, sometimes it tries to extrapolate and do things that full engine management solutions do by changing variables in the ECU that when changed together produce an effect similar to the one managed explicitly by a standalone computer. It's all guesswork and it can lead to your engine blowing up.
They're a CHEAP way to do things for people that can't justify spending more money.
It's all around a bad idea, the article I posted has more information from someone who has more experience than I do with EFI systems.
Once again this phrase has meaning:
Fast, Reliable, Cheap
Pick two
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