K12 decat

Anyone done a proper decat on a K12 please? And I mean one that meets current MoT standards, i.e. cat casing remains in place to pass visibility check but guts are gone.

My questions are:

1) Is stripping out the innards a DIY job or does the thing need cutting open and rewelding?

2) Does it need an ECU remap like a lot of other motors?

Thanks in anticipation. :)
 
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