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After having an airaid system installed and a Diablo Sport tuner installed on my 2013 mustang gt with 14800 miles I am left with a 10 mph off. I found this out when a very reputable shop replaced my 3.15 gears with a set of 3.55.Help please.
Is your Diablo Sport tuner a handheld device? There may be a way to adjust for the rear gear ratio change. If not, go to whoever uploaded the tune on your car and see if they can help.