Zip

...at low-ish revs. Had it on the ramps at Kwik Fit, and couldn't trace it. Had the mid section heatshield off - not that, not the downpipe heatshield either. It sounds like a stone rattling in the horizontal section of the downpipe itself, but a "pipecleaner" shoved up the end didn't reveal anything. The (spotty) guy wondered if the catalyst could be breaking down (93WRX), but I don't think he knew what he was talking about.

It's driving me (and the neighbours) bonkers. Any ideas???

Ta, Zip