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The threaded holes in the exhaust pipes are 12mm . I am not using the O2 sensors , but rather the resistor plugs in their place. I am not sure what the other Delta 400 users are doing , this is what I am doing. I know my bike ran better without the O2 sensors and using resistor plugs in when running the SC Typhoon . When I converted to the Delta 400 , the resistor plugs are still installed , so if there is a benefit to running the O2 sensors I can't say yet .