Quote:
Originally Posted by Ecky
Depends on where it's at. If it's upstream of the catalyst, it could be introducing oxygen into the system.
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Agreed. And if it is downstream of the O2 sensors, then there will be no really significant change in power or FE. The ECU adapts to changes in AFR or airflow. Without a comprehensive exhaust tune, including your ECU little is likely to change--especially if what you have is just a rust hole in a muffler or pipe downstream from the sensors.