I just fitted an e85 Walbro 460 into a V8 Soarer, I could barely hear it. If you instal it correctly it will be quieter than most pumps out there, including the Nismo/Tomei.
My twin 255 setup definitely heats the fuel on hot days, within two or three hours. No issues with the tank, just the pumps get a little noisy, and a little rail evaporation I think which makes re-starting take a little longer.