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Old 03-10-2014, 03:26 PM   #1
Dave07997S
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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.

Dave


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Old 08-31-2014, 11:46 AM   #2
TheDivaDanielle
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it's been a guarantee on every single modern car that I've had that catless, highflow cats, etc. they have all required a tune. Mustangs, GTPs, GTOs, Focus, etc. they'll all need a tune. If you haven't you should consider it. You might not *need* a tune, but it's a possibility when you deviate from stock in that regard.
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