The engine will get a little quiter when correct and power will be better. At some point you need to put too much in. Increase flow until the car stubles, that will be too much. Then work down to best power. The main reason for making the car run bad is so you know what that feels like. If you tune the car on a hot day and then the weather turns real cold the car will run bad.
Basicly it is by feel or on a rolling road.
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Brad
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