The answer to 'repiping making noise' is that repiping a home can sometimes cause noises, especially during the initial installation process. Common causes include the new pipes expanding and contracting as water flows through them, or the pipes rubbing against framing or other building materials.
Some typical symptoms include banging, whistling, or gurgling sounds coming from the plumbing system. While these noises can be concerning, they are usually not a sign of a serious problem and will often subside over time as the new plumbing system settles in. However, if the noises persist or get worse, it's a good idea to have a professional plumber inspect the system to identify and address the root cause.