I disagree, the cat in the downpipe is the big one you need to pass an MOT. Removing it requires a remap to be safe. No way will you pass an MOT with just the uppipe cat.
There are 3 cats on a bugeye wrx - uppipe, downpipe and centre (and there's also a resonator in the long straight section which meets the backbox).
The uppipe cat doesn't do much, plus its a sod to change - either headers off or turbo off, depending on which way you want to do it. If your car has the PPP, it will already have had the centre cat removed.
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