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After adding a mod, say an intake or exhaust...how long before the ECU learns the new parameters for it to provide the right adjustments and a mod can be appreciated?

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From my understanding (could be wrong) the system is at factory settings so the only thing it might read different is the air coming from the intake if we have a MAF sensor. I wouldn't think it will "relearn" any exhaust stuff, i doubt we have a sensor their.
 

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Yep. It would have to be re-mapped... as far as I know no one has cracked the U.S. ECU yet. That is why I say any mods to intake or exhaust will be minimal until someone breaks into the ECU and offers mapping mods.:D
 
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