Wotcha and welcome - great looking motor with some nice mods. I would get the map checked if you run the decat pipe, given it has already had one it would be better to get the parameters checked. FMIC would be a complimentary addition if it has had those mods done - not sure about the fitting - attaching it wont be an issue but I dont know if there are any bodywork mods needed.
Mot - depends on your tester, might get away with out changing it