Vibration nose from exhaust - what could it be?

I own a 2008 Toyota Avensis that has covered 30,000 miles. On tick over I get a vibrating noise from the exhaust; if I touch tailpipe with my foot or increase revs a little bit it goes away. I have replaced two of the mounting rubbers in the middle, but the problem persists. Do you think it might be from inside exhaust?

Asked on 12 July 2013 by J&P

Answered by Honest John
The idle speed is probably too low, leading to engine vibration which is magnified down the exhaust pipe.
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