NGK Iridium IX Spark Plug - XR4IX

NGK Iridium IX Spark Plug - XR4IX. NGK is the worlds largest manufacturer of spark plugs. NGK's extensive range of spark plugs has been designed specifically to suit individual engine applications and are manufactured to match or exceed original equipment specifications. NGK's IX Iridium Series Plugs were Designed Specifically for the Performance Enthusiast.