Pivot Spark Earth Removed due to vehicle replacement. It was used normally until removal. Manufacturer's Description: ※ This product stabilizes ignition performance and improves engine performance with a double effect: a noise filter circuit that quickly suppresses noise during ignition coil ignition and reinforced grounding. Please refrain from purchasing if you are concerned about used items. Also, I cannot provide advice on installation. There are manuals and information from those who have installed it on the internet, so please refer to them.