Do not look at it directly in terms of "gains" from a tune, but also what else you get from tuning.
Uprev and Cobb offer wide range of data logging abilities, multiple maps for specific build you are running. Custom maps like valet, theft, etc. Also, a tune will bring the car back into a safer area of running, and while the gains may be minimal at most the car will respond better and "feel" better throughout the entire power band.
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