I'm wanting to add the Rain Sensor and Auto Head Lights to my 3i which doesn't currently have it and was wondering what is needed to do this. I've read other places that it costs in excess of $2000 for this but that can't be right. That seems ridiculously high. But I want it to be factory and not aftermarket. I know that there are companies that sell these kits but I want it to be Mazda. Obviously I know I'm going to have to buy the new headlight and wiper stalks on the steering column but what else is needed to do this. Where do the wires go and are there already plugs for me to plug them in to. I thought maybe everything would be prewired and all I would have to do is mount the sensors on the windshield and plug them in. But can someone please give me some adivce. Thanks.