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I've been running the full ESS exhaust with HFCs for over two years and no CEL. I used the system for over a year without the ESS tune (so that's not the reason for not getting a CEL). Good luck!
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| **PREVIOUS** | 2012 E92 M3 | ZCP | DCT | Jerez Black | Black Novillo |
| **PREVIOUS** | 2014 F13 M6 | DCT | Black Sapphire | Black Extended Merino |
| **CURRENT** | 2011 E90 M3 | ZCP | 6MT | Space Gray | Black Novillo | |