I assume this also fits OK on the 4200 Facelift..??
It fits all 4200/GS models.
The current loom that is supplied is for both the DBW module and the piggie back ECU.
If fitting just the DBW you don't have to splice in all the wires.
The loom has two switches, one for the DBW, one for the ECU which is redundant if not fitted.
When I bought mine secondhand I had to send it off to FD for testing and configuring to suit my car build number, for they would not supply a loom alone and I didn't have one.
If you have the loom, if you speak to FD, they will say for it to work correctly they still have to test and configure for your particular car....