it changes the way the car changes gears. It holds the revs out longer and it also drops down the gears quicker. people dont think it does too much but in my car its all the difference.
its mainly used for towing mate when u have a heavy load just holds your revs out longer so u can get up that steep hill or do what eva. john pretty much said it all
End Of Story! Done to death. This applies from VT Onwards. If you searched the forum you might've found the answer at least 20 times!?
The power button (as already said) makes you rev harder....use your imagination, it doesn't just apply to towing
