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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Powertrain and Drivetrain Discussions > NA Engine (non-turbo) / Drivetrain / Exhaust Modifications > What exhaust components can I remove errors without errors?



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      04-18-2022, 09:44 AM   #1
mjacob23
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What exhaust components can I remove errors without errors?

I have a 2011 328i drive sedan and would like it to sound a little better. Not crazy loud just a little more open. Would it be possible to do a muffler and a 2nd cat. delete without having any sensors/errors go off?
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      04-18-2022, 11:00 AM   #2
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Yup, you could. Just research known good setups in the forum.
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      04-19-2022, 01:35 AM   #3
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Quote:
Originally Posted by mjacob23 View Post
I have a 2011 328i drive sedan and would like it to sound a little better. Not crazy loud just a little more open. Would it be possible to do a muffler and a 2nd cat. delete without having any sensors/errors go off?

You can remove or change anything you want past the downstream o2 sensors without throwing codes, as there are no sensors past there.
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