I would love ttaking a picture, but the motor on a junk yard by now )).
madmaxz24 is right. For example on trucks you can use that plug to start the engine in the mornings. At winter.
sorry syntax...there would be no reason to plug in a mx6 for cold winter starts... its not a high compression engine using glow plugs and it's not carburated. only reason it would be there is because someone else installed it, not Mazda
Besides the point, there is no reason for you be posting about this is a klze FAQ. If you want to then open your own thread (maybe it will stay open?).