We find honesty to be the best practice if a problem comes up. The dealer is willing to work with you more. The dealer is usually more concerned with physical things, like super chargers on auto cars, than tunes in the ECU.
On the dyno discussion, at dyno is simply a tool. Each one reads a bit differently. The technology used in each brand is different. So its impossible to compare lets say a Dynojet or a Mustang and a Mustang to a Dyno Dynamics. As a customer, the only thing that is important is the gains before and after the tune, and the ability to get at cells while tune, so that no street tuning is needed. These dynos are called steady state or load bearing dynos. Those are the machines you want to get on.
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