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[mark.adams]

Okay, car back from garage, rattle is confirmed as coming from the cat, mechanic says internal part of cat has broken away and is loose inside the metal casing, he suggested i put a block of wood above the cat and use a hydraulic jack to squash the cat to stop the internals from rattling
He also said he has smashed the cats before now and they still go through the emissions test and pass as long as the lambda is working

[Broomies Mate]

I've seen 'squashed' CATS before.  It will shut it up, but you are not fixing a problem.  You may even restrict the exhaust to a point where you will do serious damage to other parts of the engine.

If you cant afford a new cat right now, leave the rattle until you can.  It's the only sensible thing to do.

[Marks DTM Calib]

Okay, car back from garage, rattle is confirmed as coming from the cat, mechanic says internal part of cat has broken away and is loose inside the metal casing, he suggested i put a block of wood above the cat and use a hydraulic jack to squash the cat to stop the internals from rattling
He also said he has smashed the cats before now and they still go through the emissions test and pass as long as the lambda is working

Genuine cat or aftermarket?

[Marks DTM Calib]

And it wont pass emisions either!

[mark.adams]

Its a genuine one, is it likely to fail emissions as it is now?
I can put up with the rattle until i can afford a new cat.

[Broomies Mate]

It's not guaranteed to fail, but chances are it will. 

[mark.adams]

Any idea of the price for a new one?
2.2 petrol 2002 model saloon.