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I have run my piggyback for about 3 years now - search my username for details.
A reflash is clearly more sophisticated, but less flexible, since there is no DIY option out there to do it.
Don't even think about a piggy unless you have at least basic idea of how feedback control ECUs work, especially the OEM requirements for stoichiometric A/F ratios in closed loop status or you will chase your tail in tuning or, worse, destroy something.
If you are NA, get Charlie's reflash.
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