The overflow is not bad at all, actually the sumo is louder. I am going to box out the pump section and work on a few things to lower the volume over all...lolJason how is the noise on those overflows? Have you got the second pump plumbed in yet? If they are noise you should duct tape 1" styrofoam together into a box that covers that section. I bet it would help quiet it down a lot.