Just had a reply from Mike at Torque on how to do this, he sent me this:
If Delimiting is required, follow the below instructions :-
Locate the engine ECU behind the carpet trim, below the glove box. Unplug the Grey ECU plug.
Locate a White / Green wire : Pin 4 : Centre Row.
Cut the White / Green wire 4cm from the plug and insulate the LOOM side.
Join a length of wire to the PLUG side of the White / Green wire.
Re-fit the plug and neatly run the extended wire back to the converter.
Join the wire to the converter BROWN wire.
Sent from my SM-G960F using Tapatalk