Ford Mustang Forum - View Single Post - Is it possible to run long tube headers without a new tune?
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post #27 of (permalink) Old 06-15-2012 Thread Starter
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cpembach1's Avatar
Joined: Feb 2012
Location: Fairview
Posts: 416
Originally Posted by adspru View Post
My car had 0420 and 0430 codes for several thousands of miles before I had the Rear O2's turned off.... There should not be any negative impact from a catalyst below threshold condition... YMMV.
That makes me feel must more at ease. Thanks!
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