Ford Mustang Forum - View Single Post - Have 2015 Mustang GT w/ PP manual. Does header void my warranty?
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post #4 of (permalink) Old 06-12-2016
scottmach
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Joined: Aug 2008
Location: East Haven
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Mid length headers will also move the cats. Because you're in California it's probably not wise to go down this road. Headers really should be tuned and then you can kiss any chance of having your car worked on if something goes wrong in the drivetrain.

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