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Tuning is going to vary, based on the experience of the shop/tuner, the type of dyno used, and a host of other factors. Some shops will make 5 pulls and say...done. Others will actually tune the engine completely. You basically get what you pay for. We charge $400 for a split second tune.
Sharif tuned my Vortech after I installed it. He got me an extra 30 whp over the initial SS setup. Well worth the cost and the drive up there (220 miles for me).