Drag Specialties Oxygen Sensor Bung Adapter Kit For Harley Designed for individuals looking to replace their catalytic converters or install early-style exhaust pipes, this comprehensive kit facilitates a straightforward modification. It enables users to explore a wider range of exhaust options by providing essential components needed for the alteration. Whether the aim is to enhance performance or achieve a specific exhaust note, this kit ensures a seamless transition, supporting custom exhaust setups with ease. Features: Allows use of later 12mm O2 sensors in earlier exhausts equipped with 18mm O2 sensors Contains two bung reducers, and extension wires to extend your sensor harnesses if necessary