How can i check if i have plugged/blocked cats? - BMW M5 Forum and M6 Forums

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Old 24th May 2011, 00:23   #1
pyro225
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How can i check if i have plugged/blocked cats?

whats the easiest way of doing this?
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Old 24th May 2011, 14:39   #2
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by removing them and having a peak inside.
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Old 24th May 2011, 14:41   #3
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And isthere an easy way to refit?
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Old 24th May 2011, 14:44   #4
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unbolt, bolt back on.....I don't see the difficulty here.
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Old 24th May 2011, 17:35   #5
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What do I use to test?
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Old 24th May 2011, 17:39   #6
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a flashlight and your eyeballs?

Last edited by mattmartindrift; 24th May 2011 at 17:39.
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Old 24th May 2011, 19:26   #7
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a flashlight and your eyeballs?


Lost it at work, HAHAHAHAHA!
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Old 25th May 2011, 00:51   #8
pyro225
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Obviously you've never taken off a
Stock exhaust as it's one piece with no joins all the way to the manifold... That's showing one
Cut and clamped together....
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Old 25th May 2011, 00:58   #9
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I believe Matt is saying remove the O2 sensors and peak inside.

Process of elimination: Are fumes exiting the mufflers? If so, remove 6? Fumes exiting hole? If so, remove 4.
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Old 25th May 2011, 02:52   #10
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I believe Matt is saying remove the O2 sensors and peak inside.

Process of elimination: Are fumes exiting the mufflers? If so, remove 6? Fumes exiting hole? If so, remove 4.


I wasn't, but BMW sells the kit to "clamp" them back together.

but, if you can borrow/rent a borescope, you could do the O2 removal method.
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