THUNDERMAX Oxygen Sensor 309-355

Easy installation: replace the factory ECM, install new O sensors and harness, load the correct map for your bike, and ride, New maps, software, firmware updates, map analysis and tech support available online at no charge, Does not require dyno tuning, Made in the U.S.A., Because of possible clearance issues, some aftermarket exhaust systems may require modifications or relocation of their O sensor port bungs.