Ive got one on my Focus RS. All connections should be done within the cabin, ie dont run the wires into the engine bay as they are likely to pick up rogue signals. They are not the easiest of things to set up, mine still isnt fully configured. APT are the fellas to speak to re install & setup, they have fitted loads to jap cars and helped me out big-time after another so called "expert" tuner fucked up my install.