Agreed, there arent any sensors at all behind the cats, im willing to bet youre probably running a rich/lean condition and its probably triggering the code, throw some G3 intakes on it and maybe it'll balance out! Go to autozone and have them check the code and report back.
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2011 Mustang 5.0 | 3.55's | Lethal Performance off road H-Pipe | Magnaflow Muffler Delete | JLT CAI/Bama tuned 417whp/ 404 ft/lbs
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