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Premium Member
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11,741 Posts
Discussion Starter #1
I need to weld a bung on the stock jdm primary. How far away from the head does the o2 sensor have to be?


I was thinking of putting the bung on the #3 runner, just above where all the extra tubing is welded to the runner. Would that be too close to the head?

Also, I don't want to put the o2 too far down, like on the downpipe, since I already have a stock o2 sensor, and the wire isn't that long.
 

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SNAIL SQUAD
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10,271 Posts
You can extend the wires on the plug side and not the O2 sensor. Keep in mind it may be easier to put the O2 on the down pipe. It does come located there in JDM land when using the exhaust manifold. It might alot be a PITA to put a bung on that manifold. It is hard stuff.
 

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Premium Member
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9,405 Posts
Why not put it on the secondary, at the 2 - 1 merge, like on the Fujitsubo?
 

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CAR SLÜT
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1,622 Posts
On cyl 3, just above the flange plate, just above the front dog bone.
 

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AWD owns me
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4,167 Posts
I recommend a merge or front pipe.
 

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Premium Member
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11,741 Posts
Discussion Starter #7
I had to cut out the flex pipe and put a solid pipe in there, and just welded the bung to the newly added pipe. Just had to pull back the wires a bit, and didn't have to add any new wires.
 
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