How can i check if i have plugged/blocked cats? - BMW M5 Forum and M6 Forums
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post #1 of 14 Old 24th May 2011, 12:23 AM Thread Starter
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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post #2 of 14 Old 24th May 2011, 02:39 PM
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post #3 of 14 Old 24th May 2011, 02:41 PM Thread Starter
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post #4 of 14 Old 24th May 2011, 02:44 PM
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post #5 of 14 Old 24th May 2011, 05:35 PM Thread Starter
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post #6 of 14 Old 24th May 2011, 05:39 PM
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a flashlight and your eyeballs?

Last edited by mattmartindrift; 24th May 2011 at 05:39 PM.
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post #7 of 14 Old 24th May 2011, 07:26 PM
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Quote:
Originally Posted by mattmartindrift View Post
a flashlight and your eyeballs?


Lost it at work, HAHAHAHAHA!
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post #8 of 14 Old 25th May 2011, 12:51 AM Thread Starter
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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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post #9 of 14 Old 25th May 2011, 12:58 AM
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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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post #10 of 14 Old 25th May 2011, 02:52 AM
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Originally Posted by wentouch View Post
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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