Catted downpipe and SES for cat inefficiency
Is anyone running a aftermarket catted downpipe and not getting a CEL for inefficient catalyst P0420/0430 codes. If you are what are you doing about it?
I am interested in the Steeda part when I get my ST and wondered about would you still get a CEL for P0420/0430.
2007 Porsche 997S Speed Yellow, Black Sport seats, manual. X51 headers, AWE cats and Borla cans.
Foci: 2007 Ford Focus ZX5 SE Man...stock except for the General UHPs.