Weld in O2 Sensor Bung

*Weld in O2 Sensor Bung* This is a must for all engines with a factory O2 SensorsIF YOU'RE NOT RUNNING YOUR FACTORY O2 SENSOR THEN YOU'RE LOOSING POWERFits all Suzuki, Honda and Kawasaki O2 Sensors
Yamaha part coming soon.
Easy installation, Drill 5/8" hole and weld in bung
We have other parts to make your engine swap and/or upgrade easier