i can't tell you if the g27 is quieter than the G25, but the G25 is fairly quiet already. compared to my original Driving force pro that came out with Gt4, it is a world of difference. that DFP was noisey as hell, i couldn't drift late night as it could be heard easily from a good distance. not sure the price difference, but it seems the G27 is just a "flashier" G25 with some extra buttons, and lack of Sequential shifter.