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well if its light ticking, its just thermal expansion ans contraction of the whole exhaust system, flexing at the joints, etc. If its more of a rattle, then its a heat shield
My cats ticked after taking the car through heavy rain/flooding. It went away in about 2-3 weeks. That's the only time I've had audible "clicks" or "pings" from the exhaust... and sometimes they were loud as hell.
It would even keep going for about 30 seconds after the car was off.
well if its light ticking, its just thermal expansion ans contraction of the whole exhaust system, flexing at the joints, etc. If its more of a rattle, then its a heat shield