Does a hot water heater make noise when it's going bad?
How do I replace an idler pulley on a Subaru legacy outback?
Should a hot water heater make noise?
What are causes of noise's coming from a Ford Four Liter Lifter?
What should I do when my hot water heater makes a popping noise?
Why is my water heater making a knocking noise?
Why would a water heater make a whistling noise?
Potentially two things - either the metal shrinking/expanding due to heat or perhaps there is a lose nut/bolt/bracket/etc on the inner side of the shield
The rattle in the catalytic converter is usually a warning that it is about to fail as the catalyst breaks up it will fall apart. and eventually plug your exhaust.
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