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On the 1M it's just a throttle mapping which changes. Doesn't give any more power. You can feel this when going WOT. Playing with the button will make zip difference.
Hold part throttle and press the button and you'll feel a surge, just as if you'd stabbed the accelerator, ie it just gives more throttle for same pedal travel.
Sadly it doesn't really do much else and not something I use all that much at all on a daily basis.
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