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Average is between $250-$450 depending on the tuner/dyno machine and state. If you want just one standard tune and dyno. $350 is the max I would pay. I had a quote for $350, but he only takes the car cold. Tunes it. Lets it warm up. Tunes it up again. Lets it cool and checks it again until the t-stat opens up. Basically a 2 stage tune. 2in1 deal!