I was told that

"The UK MY97 Prodrive ECU was designed to retain the standard down cat, the centre cat was replaced with an STI resonated centre section." "...and you cannot tell it has centre decat as the units look identical. So much so that when mine arrived from the breakers I was convinced it was a cat centre pipe and had to put a hose pipe thru it to convince myself it was a decat."

Anyone got one for sale?

 

Got both of mine from grade A Subaru, about £50 inc P+P IIRC.

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Will obviously be a bit pricier to Germany tho.