From what I've read it reduces the power steering assistance to 80% and sharpens the throttle response below 3000rpm IIRC. However, it adds 5bhp, and I can't see how that would be possible by doing those things. I'm sure I've seem a torque curve and the torque is increased throughout the rev range, and I think it is more at higher revs, which is where it'll get the extra bhp.
The sport's button adds no extra power what so ever.
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