You can always pull the battery cable for a few minutes and reset your ECU to stock. It might make it turn off, but it will definitely make your ECU have to relearn how you drive and power/fuel economy might suffer for a while. So long as you have the Cats on, and the same O2 sensor, there shouldn't be any issues with new pipes though.
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\'05 6MT Coupe, DG, Premium, Motordyne 3/8\" plenum spacer, Z-tube.
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o2 sensor
