Exhaust Gas Fittings Bungs

Adding a wideband or narrowband oxygen sensor, an EGT probe or a back pressure fitting starts with the right bung. This collection covers the Vibrant Performance exhaust gas fittings, including standard and J style O2 sensor weld bungs, motorcycle M12 x 1.25 bungs and O2 sensor socket tools. The J style bung angles the sensor so it fits under cars with low clearance and keeps the tip away from pooling condensation.

Placement tip

Mount sensor bungs in the upper half of the pipe, angled at least 10 degrees above horizontal, and far enough downstream of a turbo to avoid excess heat.

What thread is a standard O2 bung? M18 x 1.5 for most automotive sensors. Many motorcycles use M12 x 1.25.

What's in This Collection

  • 17 products from Vibrant Performance, priced from $3.29 to $279.99
  • Sizes: 1"
  • Materials: 304 Stainless
  • Free shipping on orders over $150

How to Choose

Match the tube outside diameter and material to the rest of your build. 304 stainless is the most common choice for exhaust, 321 stainless handles the extreme heat of turbo manifolds and headers, titanium saves weight, and aluminum is the go-to for intake and intercooler piping. Wall thickness and bend radius matter when you need parts to fit together cleanly.

Common Questions

Do I need to back purge stainless when welding?

Yes. Back purging with argon keeps the inside of the weld from sugaring, which gives you a stronger, cleaner joint.

Can I mix stainless and mild steel?

You can weld them together with the right filler, but the joint can rust over time. For best results keep the system one material.

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