This weld on boss is designed to allow the fitment of O2 (lambda) sensors to an exhaust system which do not have provision for one. The boss has an M18 x 1.5 thread which fits most types of sensor including Bosch. The kit is also supplied with a blanking plug and copper sealing washer for if the sensor is only to be fitted temporarily for tuning purposes. Allows O2 (lambda) sensors to be fitted to exhaust systemsAccepts most common types of sensorIncludes a blanking plug and sealing washer
