BMW M3 Forum (E90 E92) - View Single Post - E92 M3 stock exhaust / emissions question

CCase · 05-05-2025, 11:24 PM

Muffler doesn’t matter but the front cats and tune do. O2s have to show ready on the scanner or it won’t pass. Not California serious but certainly annoying, especially when cat delete is the best way to make power on the s65 platform.

05-05-2025, 11:24 PM	#2
CCase Enlisted Member 21 Rep 38 Posts Drives: 95 M3 Join Date: Apr 2011 Location: DFW, TX iTrader: (0)	Muffler doesn’t matter but the front cats and tune do. O2s have to show ready on the scanner or it won’t pass. Not California serious but certainly annoying, especially when cat delete is the best way to make power on the s65 platform.
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