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US spec cars don't have OPF or OPF sensor so none of the catback exhausts will throw a CEL. As long as you don't touch the primary cats, you should be fine. If yours is EU spec car with OPF then it's a different story. I'll let other members with OPF equipped M2Cs chime in regarding which options are CEL-friendly. However, I remember reading even Remus Race axle back threw a CEL on some M2Cs with OPF.
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