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I have an annoying rattle in my 03 Legacy wagon that started a couple months ago. It is definitely coming from the front half of the car. It was small at first, and wasn't constant.  Now, it has grown to a constant loud rattle at idle.  When I accelerate, it rattles louder and faster upon initial accel, then goes away once underway. I have checked all the shields, and none seem to be loose.  The only thing I can think of is the cat.  Agree, or other ideas of what it could be?

Edited by Timberwolf530
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When an exhaust shroud comes loose it makes a high pitch zzzzzzzzzzzzing, and clatter sound. Broken cat media sounds like gravel stones bouncing around in a metal bucket. Most likely it is a loose shroud. Can be quieted down with a hose clamp, or use a hammer and drive in a large bolt as a wedge between the pipe and the shroud to prevent it from rattling.

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