Ok gentlemen, here goes, P0420 Catalyst System Efficiency Below Threshold Bank 1, im thinking 02 bung could use some steel wool in it, or there is a leak where the collector gasket should be. Ideas?
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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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