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I would suggest putting the headers back to stock, including the O2 and EGT sensors.
That should get you past the sniffer test and mitigate potential check engine light issues.
The rest you can season to taste.
I have stock headers, RE section 1, which is just pipes with no cats or resonators, stock X-pipe, and RE cans.
The sound is incredible, passes the sniff test, and E-Z Smog has no idea what a stock Z4 ///M is supposed to be, and really don't care.
Depending on where you are in SoCal, you may want to try them. On La Palma in Chino, near the Stoney Lonesome.
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Warning: May contain traces of nuts.
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