The Speedflow 989-M14 weld bung is designed to suit M14 x 1.5 oxygen (O2) sensors, available in both steel and stainless steel variants. Ideal for custom exhaust fabrication, it allows secure installation of sensors for EFI tuning, data logging, and engine management systems. Precision-machined for accurate thread engagement, this weld-on bung is suited to headers, dump pipes, and exhaust systems across motorsport, street, and fabrication applications. Features M14 x 1.5 internal thread for O2 sensor compatibility Available in steel and stainless steel variants Precision-machined threads for accurate sensor fitment Weld-on design for permanent installation Suitable for EFI tuning, data logging, and engine management systems Ideal for motorsport, street car, and track car builds Typical Applications Exhaust systems requiring O2 sensor installation Turbo dump pipes and custom exhaust fabrication EFI tuning and wideband sensor setups Data logging and engine management systems General fabrication for performance exhaust systems Fitment Notes Designed to suit M14 x 1.5 O2 sensors Select steel for mild steel exhaust systems or stainless steel for stainless exhaust systems Requires MIG or TIG welding depending on material Ensure correct sensor placement angle and heat exposure For unused ports, use a suitable M14 x 1.5 plug
