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bartine, is this shop going to use a canned tune or are they actually going to put your car on a dyno and then tune it?
If they aren't going to dyno it, I would not bother. I think you could see gains in mpg, but only if your car was dyno'd. Every car is different even though they could be the same exact model. Canned tunes are usually a good starting point.
Like mentioned, the gain could be really small and not worth it. If they dyno tune it, the price may increase.
Like cmj wrote, mod the driver first.
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