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Oxygen Sensor

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Howell includes a single O2 sensor (and the weld-in bung) to get readings of the exhaust back to the ECU. We know what you're thinking right now, and no, you don't have to run single exhaust to get this system to work correctly. If you have dual exhaust, it'll be OK to put the O2 sensor on either bank of cylinders. Jeeps R Us chose to put theirs near the driver-side header collector.