I am looking to get a pulley and dyno tune for my 2011 Gt500. I called a local mustang performance shop, and they told me in addition to the pulley and dyno tune I would also have to purchase a handheld tuner, which puts the price well above what I was prepared to spend. To my understanding getting a custom dyno tune with a pulley would eliminate the need to have to purchase a handheld tuner. Is this true, or is the shop trying to gouge me for more money? Any clarification would be appreciated. Thanks.