80psi is considered the maximum that should be available in a residential unit...more and you should have a PRV.
If the pipes aren't anchored well, the intertia of the water stopping fast when you close the valve can cause the pipe to move and hit things (like the wall after making a 90-degree bend). Good practice should have anchored the pipes, but as a retrofit, you can add some hammer arresters near those valves that have that problem (it needs to be close to the offending valve to work). You'd likely have to tear apart a lot more to anchor the pipe, and that wouldn't do anything to poorly routed ones.
Sioux Chief and Oatley make various versions and are the better known brands. Some can be installed by screwing them on, others require cutting pipes and inserting them. What you don't want is just a simple pipe stub...these quickly get their air absorbed into the water and no longer perform their normal function.