Weld-On O2 Sensor Bung sti - Diameter 350mm
Weld-On O2 Sensor Bung sti - Diameter 350mmOxygen Sensor Bung If you are installing the O2 sensor in your car and plan on keeping the stock one there to keep your ECU happy you will need to weld in a bung. M18 x 1. 5mm Thread
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