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E90/E92/E93 M3 (2008 - 2014)
4th generation E90 M3 sedan, E92 M3 coupe and E93 M3 convertible. The last of the naturally aspirated M3s, powered by a 4.0 liter V8 making 414hp and 295 lb-ft of torque.

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Old 05-10-2019, 05:12 PM
JLHoodJr JLHoodJr is offline
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Location: West Texas
 
Join Date: Oct 2015
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Mein Auto: 2010 M3 Convertble
E93 catalytic converters

The warning light on 2010 M3 came on saying “excess emissions” and have engine checked soon. I took it in and both catalytic converters registered over .9 on the emissions test. The dealer doesn’t work on them, but instead replaces them - for the modest cost of $7000 (not a typo). The service advisor said to have a muffler shop take a look at them as they can usually repair them. I’ve not noticed any effect on the motor’s performance. Two questions, are replacements really that expensive? And can they really be cleaned out so they’ll function?
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Old 05-14-2019, 05:01 AM
Jon Pappas Jon Pappas is offline
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Location: Miami, FL
 
Join Date: Nov 2018
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Mein Auto: 08 BMW M3 Convertible E93
Not sure how strict TX is with emissions but you may want to consider removing the cats. Another option is to go with high quality high flow cats (Active Autowerke has the pair for ~$1700).
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Old 05-14-2019, 04:22 PM
JLHoodJr JLHoodJr is offline
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Location: West Texas
 
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Mein Auto: 2010 M3 Convertble
Thanks. I live in El Paso which is a non attainment area under the Clean Air Act, so it’s pretty strict. I’ll check Autowerke.
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