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does GrandPrix fit with this G6? GM refined 3.8L to 3.9L engine?2005 G6 2+2 coupe with available including a 2.4-liter DOHC Ecotecfour-cylinder engine producing 170 horsepower ; 3.5L OHV V6 making 200horsepower and featuring electronic throttle control and last with ahigh-output, 3.9-liter V6 making 240 horsepower through variable valvetiming 245 lb.-ft. of torque at 3,200 rpm.