Chunky, you just unplug the lead that clips into the motor housing, then plug the module into the lead, put some blu-tac into the hole left in the motor housing to protect the contacts, this will be a great decision should you reverse the modification years down the road, then cable tie the lead with the module plugged into it to the motor housing to keep it dragging down the road.
Oh, make sure the flap in the exhaust is open when you unplug the lead from the motor housing, the best time is after a cold start, turn off the car ignition, then do this mod, when you turn the car back on it will have no error codes and the flap will remain open, pops in Normal mode and more noise, best cheap mod ever
hope this helps
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