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If both o2 sensors are in the header, then its a sure CEL since my only CAT is in the front pipe.
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2013 Subaru BRZ Metallic Grey 6-Speed - Mods: HKS Drop in, Perrin Inlet Tube, Kartboy Crank Pulley, Berk HFC Front Pipe, Borla UEL Header, PLM Overpipe, Open Flash Tablet Stg 2 tune
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