IMO Save your money and pass on the servo buddy, get the ECU to Dano.
Reag said the M4 comes with a little piece for the servo motor, my Arrow one was aluminum. You have to disconnect the servo cables from the stock exhaust to remove them, and up underneath the seat near shock (tight fit to get to) left side, is a little black box which is the servo motor (follow the cables) Detach it. You then attach the supplied piece to the center post of the motor there, it acts as a “stop”, stopping the rotation of the motor, fooling the ECU to think the exhaust butterfly is still there. I guess you have to reinstall the servo motor box and hide the cables somewhere.
I unplugged and removed my servo motor completely as had the ECU flashed, so didn’t have to deal with this. If you are going to flash the ECU, you can choose to leave in or remove the 02 sensor. And definitely (at least) plug the PAIR valve hose with a marble right side underside of airbox. Search for info on the Forum, many discussions with pics somewhere
I don’t think it will take a full week to send and receive from Dano. Keep us posted on your progress!