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Yes, I would say, internals of silencer resonating, followed by all kinds of other things which could be loose or touching, even an incorrect or misaligned exhaust hanger. I would do what other folk say, and have it up on ramps, with someone revving to the required rpm, you can also feel components, and feel for the vibration (quite useful under the bonnet when the noise is hard to pinpoint) also, does the car have a viscous fan, if so, removing this will reduce the noise too allow you to hear the one you're looking for.
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Take it to your friendly independent fast-fit exhuast place and look at it on their ramps for free.
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Thanks for all the ideas - will do as suggested. The car has no cat (thank god!) and so it could be something else resonating.
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