alot of times its power steering or the torque converter you are hearing, i doubt with a stock air box and stock pulley you will hear the charger whine much. i got a few of these grand prixs, gts and gtps that i nick name crybaby for this whine they make(stronger than most) they all run fine with no issues. i do not think you have anything wrong..btw use only premium gas in your gtp! =)