What are these for?
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Posting Guru
Joined: Jul 2011
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From: Elk City, OK
What are these for?
Whatare these tubes for that go into the cat?
There is also this little thing that is between the pipes at the joining of the y-pipe. What's it for? Looks kinda like a weird spark plug.
There is also this little thing that is between the pipes at the joining of the y-pipe. What's it for? Looks kinda like a weird spark plug.
Senior User
Joined: Nov 2012
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From: Montana
If you have an O2, you need it, as it feeds information to the cpu that controls the mixture settings on the engine. Also, depending on where you live in TX, you might have to go through emissions testing to get your license plate, if the O2 sensor is gone, it will not pass.
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Posting Guru
Joined: Jul 2011
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From: Elk City, OK
Can I just weld in a threaded collar in the pipe for the O2 sensor and let the air tubes dangle? Its obvious the O2 sensor is important, but what is the function of the tubes in stock exhaust form and what happens if they aren't in a cat?
P.S, they don't do emissions testing here. I've passed inspection driving a straight piped Cummins.
P.S, they don't do emissions testing here. I've passed inspection driving a straight piped Cummins.
Tuned
Joined: Dec 2012
Posts: 372
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From: 85716
Double check that. Diesel engine emissions rules are different than gasoline engine emission rules.
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Freshman User
Joined: Sep 2013
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the tubes pump OXYGEN into the cat, to help them "burn off" pollutants better.... if the cat is gone.. they serve no purpose.
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