Euro QV Cat replacement

My euro 308 QV had the same thing. It came with a dual cat muffler (not as graceful as the one on your car) when I bought it. Soon, those cars started to rattle. I tried to find a muffle guy to replace them but none would touch it for legal reasons- mainly they were scared to alter "original emmissions equipment" even though I told them this is not original.

So, I worked with a buddy of mine who could weld and we replaced them ourselves. I bought cheap $100 cats that fit, but they only lasted about a year and started rattling too. I just cut them out, removed all of the stuff from inside, ran a perforated pipe down each one and threw the thing back on for track only use. I bought an original euro muffler and have been using it since- unless I feel like making some noise.
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If you go the cat route, get ones with stainless steel cushioning for the catalytic elements.

The cheaper ones mount the elements with something like furnace cement that deteriorates after awhile & that's why they rattle. The Rx7 crowd found this out about 10 years ago...

 

Might be wise to use a high quality cat like these:
http://www.randomtechnology.com/index.html

This is the same company the manufactures the Hyperflow cats that everyone talks about.