Diabolus S2 Full System Exhaust For HARLEY DAVIDSON SPORTSTER 1250S Note: Installing the exhaust requires removing the O2 sensor plug, so do not start or start the engine before installing the sensor switch. O2 and all wires are back in place. Make sure everything is done so you can start the engine. otherwise it will cause the engine light to show. sound cliphttps://youtu.be/OME8oOPE9mk