JET's got it summed up. It is NOT Plug in and go play on the freeway! It is plug in and play with settings. So much control, so many potential problems! How good any part of your tune is, is dependant on how much time you spend working/learning that area. If you pay a tuner with proper experience, many people report better than stock drivability. With a lot of time working with the system, a "non pro" should be able to achieve the same or similar results.
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