2008 Yukon Denali, 135k miles, part 2!!

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PG01

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tgui

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I'm trying to install my wideband in my stock exhaust to learn the tuning ins and outs before putting long tubes headers back on. A bad tune can nuke cats so I want to be proficient before the expensive parts and cats go on.

That said I ******* hate exhaust work. Nothing ever goes smoothly. I put on a ton of anti seize and I still ripped out threads today.

This is what's going in.
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Destroyed threads. I'll have to cut that bung out and replace.
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New bung and spare sensor I had.
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Cutting and welding fun tomorrow!

The wideband will go near that stock bung location, before the cat.

Fwiw, after cat wideband sensors still read pretty accurately.
 
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tgui

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Everything welded in. Flux core makes a mess but it's cheap and easy.


All done. 1 bung for the stock sensor, another for the wideband.
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