Weld the bung at least 24 inches downstream of the exhaust port
outlet (after the collector), or 24 inches after the turbocharger if so
equipped. The bung should be welded before the X or H pipe if so
equipped.
Using a clock as reference, mount the bung between the 9:00
o’clock and 3:00 o’clock position. Welding the bung in the lower
section of the exhaust pipe can result in sensor damage caused by
condensation making contact with the sensor’s internal heating
element.
A 1” bung (provided in the kit) will best protect the sensor. When
fully threaded, the sensor’s tip will sit flush with the exhaust pipe, this
does not adversely effect the readings.