Ford Mustang Forum - View Single Post - Air fuel ratio bouncing after header install
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post #4 of (permalink) Old 02-17-2016
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olehead's Avatar
Joined: Jun 2013
Location: Raymond
Posts: 280
If it was not tuned after install sounds like the problem - I had amr headers and x pipe installed and had to have it dyno tuned to make it right with A/F and other parameters.
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