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My shop needs me to weld a bung to the downpipe in order to get a accurate 02 reading. Anyone know where to get one and if there are different sizes? Plus i guess i would need a plug for the bung for when the dyno 02 sensor is not there.
 

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The fitting thread is M18 x 1.5, and it is common to all sensors. Any muffler shop should have them, or you can order them from a place like summit racing.

Make sure they install it before the catalyst, though I'm sure that's the intention.
 
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