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Holley EFI

Holley Oxygen Sensor O2 Bung Weld-In Style

Oxygen Sensor O2 bung weld in style used for any Application that utilizes an Oxygen Sensor

Part # 534-49 Be the first to write a review
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O2 Weld Ring for any Application That Uses an Oxygen Sensor


  • Genuine Holley Quality Parts

About Holley EFI

Holley is the new standard in EFI! Whether you're engine swapping your classic car or need to manage 4000 horsepower in your twin-turbocharged drag radial race car, Holley EFI has the solutions you need to get your project up and running better than ever!

Brand Holley EFI
Emission Code5
Material12L14 cold roll steel
Product TypeOxygen Sensor O2 bung
Thread Size18mm x1.5
Type of ComponentOxygen Sensor Bung
Part Number534-49

This part is legal for sale or use on Emissions Controlled Vehicles, Uncontrolled (Non-Emissions Controlled) Vehicles, and Racing Use Only Vehicles because it does not affect vehicle emissions and is not covered by emissions regulations.

Requires welding and a 7/8" hole to be drilled into the exhaust. Oxygen sensors need to mounted with the tip pointed on a downward angle. A minimum of 10 degrees from horizontal and 15 degrees from perpendicular is recommended.

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    Some parts are not legal for use in California or other states with similar regulations.