Post #11
Whilst it could be the cat, I believe that a shot exhaust gasket at the Manifold/cat join can cause this (it did for me anyway).
Get a genuine Pug fitting kit (about £18), the others seem to come with the wrong nuts and no spacers etc. and generally can sometimes be more pain that they are worth for the reduced price. If this wasn't changed when the cat was changed, I would almost guarantee that the gasket is causing your rattling.
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Ex Owner of 2000 Phase 3 306 GTi 6 China Blue - You shall be missed
1974 Triumph Stag
1989 Peugeot 205 GTi 1.6
2003 Alfa Romeo 147 JTD Lusso
2005 Mondeo Ghia X 3.0 Estate LPG