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I just started digging into the research on a downpipe and came across this thread. I'm new to this, so please bear with me.
CEL - Check Engine Light
Catless DP - no catalytic converter so it won't pass California emissions test, correct?
Catted DP - includes catalytic converter so it will pass emissions.
JB4 - tuner that can clear the CEL code and also can be used to tune engine for DP, CAI, etc. for better performance. Question: does the JB4 clearing the CEL allow a catless DP to pass emissions testing? Or should I just go with a catted DP because, you know, California.
Thanks!
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Current: 2018 X3 M40i (PB)
Previous:
2019 M240i (EB);
2002 E46 330i in OB
Last edited by MostlyHarmless; 02-13-2019 at 03:35 PM..
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