2006 g6 gt is a 3.5l with 200hp, same as 06+ impala's,
g6 gt is 3.9l with 240 hp, or if its a convertable 227hp cause more restrictive exhaust systems(so i read with quick search on google) and i see 3:69 gear ratio!!?
some more reading says 2009 3.5l got 220hp..? change something? and 3:29 gear ratio
im gonna race me one on these grocery getters with my grocery getter one day!