Found pressure regulator on side of home installed upside down. Installed properly and adjusted pressure to 70 psi. Found no other issues with noisy pipes or pressure issues at this time. Several issues with master tub/shower valve. Valve had been leaking internally causing corrosion to the point that a new cartridge will not work. Old cartridge is corroded in place and can not be removed without damage to brass valve body behind wall. If unit gives any trouble in future I recommend new valve be installed. Existing is brushed nickel.