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A14 exhaust: where would you put an oxygen sensor? Also wow the back nut is a bear

Subject: A14 exhaust: where would you put an oxygen sensor? Also wow the back nut is a bear
by smellsofbikes on 2021/1/17 3:55:42

I have a non-stock exhaust, that drops straight down and then goes under the transmission to head backwards on the right-hand side.
Getting to the inside of the three nuts that hold that to the exhaust header is incredibly annoying.
This is mostly a complaint. I designed the exhaust poorly. But, wow, think about bolt access when you build new stuff. I wish I'd stayed with the A12 two-bolt exhaust.

However, the question part: where would you put an oxygen sensor?
I know in the A15E it was formed into the cast iron header itself.
I don't have one of those, and unless I braze, it's hard to get a port welded into cast iron.
So I'd like to put it right below the header, in the steel exhaust pipe.
Here's the problem: with the A14 (and all the non-fuel-injected cars)the joint between the exhaust and the header is a steel on steel joint, and it may leak. If it's leaking, the sensor isn't going to be accurate.
It looks like on the fuel injected models they used two flat plates with a sealing gasket.
What would you do?
I suppose I could machine a thin foil-ish copper gasket that I stuck on the joint and compressed with the three bolts to get a compliant seal.
My exhaust pipe hangs low and regularly hits the ground, so I'm doubtful that would last very long.

This might be more difficult than I thought it was going to be...