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I've 3 Ducati's (916,999,ST4) that I want to log afr (for individual cylinders) on, but I do not want to weld the 18mm bungs onto the headers.
On Amazon and other sites there are adaptors available for other vehicles, but not the 1/8 bsp of the bungs on the Ducati headers.

My question is, Do the sensors have to be in the main exhaust gas path to sample correctly? The availability of the other adaptors would suggest that they don't have to be in the gas path, but only that the gas surrounds the sensor?

I'm looking at making a 1/8 bsp male (approx.) to 18mm female adaptor. There would be a hole about 6.4mm into the exhaust, and the sensor tip would sit about 25mm from the inside of the header.

Thoughts and advice would be appreciated. Thanks, Greg
 

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The sensor HAS to be in the flow path. It’s not at all difficult or onerous to weld a stainless bung or two on a exhaust manifold. There are no weld bungs available, you still have to drill a hole in the exhaust and they are a very unattractive thing to look at unless it’s covered by the fairing.
 
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