The answer to 'repiping making noise' is that a new plumbing system can sometimes make noises, especially during the first few weeks or months of use. This is often caused by the pipes expanding and contracting as water flows through them, or air pockets in the system. In most cases, these noises are normal and harmless, and will subside over time as the system settles.
However, if the noises persist or become louder, it could be a sign of a more serious issue, such as a leak, water pressure problem, or faulty installation. In these cases, it's best to have a professional plumber inspect the system to identify and address the root cause of the noise.