Thunder Heart Performance 309-355 Replacement 18mm Oxygen Sensor
- Easy installation: replace the factory ECM, install new O² 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 O² sensor port bungs.