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The S5 doesn't have any intermediated cats. As Joe says, they are little silencers near the front underneath and often mistaken as cats. The cats on these are tucked up right beside the engine.

The rattle comes from the chain mail that covers the flexi joint at the top of the downpipes. They are nothing major and can be left.

I fixed mine with exhaust wrap and jubilee clamps. But now I have other aftermarket downpipes which have a mesh over the flexi joint, so it doesn't rattle like the chain mail OE flexi joints.

They tend to rattle just over 1000rpm, about 1200 on the way up and down revs! :)
 
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