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Originally Posted by formula M;9839033[B
A piggy is not a tune[/B], that is the reason there is already a name for such a procedure... it's called piggybacking!
And there is a major difference.. (marketing from Shiv aside)
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Despite being an advocate of direct ECU tuning over plug-in boxes, I'm going to disagree. "A tune" is what happens, or what gets applied if you will, to the engine as a whole. A plug-on box, or a direct ECU remap are the mechanisms used to deliver that "tune". Think about what tuning was before we even had ECUs - it was polishing your intake manifolds, fitting a less restrictive exhaust, whatever released some more power. Tuning is doing something to give you more power (or torque, whatever ;-) ). A piggy-back does that. A direct ECU remap does that. Both are tunes.