I think fass is quieter. Can't hear mine over engine rumble
Sent from limp mode cat eye.
i have heard of 3 people that have had burned out motors on their Fass pumps.
and one faulty airdog.
also the new airdog 2 is just as quiet as the fass titanium. and really over my exhaust your not going to be hearing a lift pump, especially since i am going to mount it by the tank, in between the frame rails.