this is the same question we keep getting asked, if you want a bullshit figure, go ask some1 else that does tunes, but dont expect to get that figure!
every car is different, in the astra turbo, we have seen massive difference between 2 cars of the same spec with just the tune, this is why we do not give any figures.
we saw upto almost 10% differnce in the astra turbo between dyno's and different cars.
another thing that people done seem to understand, forget peak power, it's the power curve change that is the difference.
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