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i read about this somewhere and if i remember correctly the power button just basically holds the gears longer and the snow button just keeps the engine from revving too high, i dont remember the specifics about it but I never use those buttons sooo.... if i wanna go fast i just switch to manual mode
Pretty much all it does. If i use it on my turbo IS i can usually get about 1lb higher boost than normal. FOr a stock car i see no real purpose.