Not sure,but if you have just DP which replace only DP section,on your bug you have two(2) cats one in DP and one in Up pipe,you can run without the remap on WRX with removed 1 cat and you will still pass MOT.
About legality or illegality i wouldn't care so much,everybody doing this...
If you are replace cat in Up pipe/both cats(DP plus Up pipe) i would recommend Remap straight away.
Jura
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