White plug requirements for 1.8t conversion

Hi, I've whittled the white plug down to the essentials for a 1.8t conversion but I'm struggling to identify part of the loom. The has been adapted before to run a k jetronics engine so I'm sure most of these plugs arnt required. I do however have the red and black wire from the white plug running to a relay (57) and an empty relay holder. Is any of this required or can I chop it out.

57 is the idle boost valve control unit 84+ K-jetronic.