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Message: <blockquote data-quote="Pennywise2" data-source="post: 612200" data-attributes="member: 9021">If you are just installing a performance chip without getting a custom dyno tune then save your money and get something else for your mustang.All the performance chips do without a custom tune is trick your PCM to lean out your air fuel ratio to make a small amount of power but this can be a potential danger to your engine as lean conditions can possibly cause detonation and could damage your engine.A tune should be your last performance mod.Get a chip installed or handheld programer with a custom dyno tune.Monitoring and correcting the AFR is key.</blockquote>