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Discussion Starter #1
Getting ready to start putting my drivetrain in and want to have my headers ceramic coated. Where should I put the bung for my o2 sensor, in the collector or the exhaust pipe?
 

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I prefer the collector of the header, just in case there's a leak at the header to pipe connection, which would throw off the readings.
 

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If this is a race only piece with open collectors, I would recommend in a primary tube (12-15" from the head). With open collector you get back pulses of clear air which gives false lean readings. Also some collectors leak where the primaries slip in.

At this point do both and you are covered. Put one in each collector and one in #1 and #8 12-15 inches from the cylinder head.
 

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Discussion Starter #6
Thanks guys, looks like I will put them in the collector.
 
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