JCERacing carries Spark Plugs from NGK, Denso, Blitz, HKS, MSD and many more . A spark plug is a device for delivering electric current from an ignition system to the combustion chamber of a spark-ignition engine to ignite the compressed fuel/air mixture by an electric spark, while containing combustion pressure within the engine. A spark plug has a metal threaded shell, electrically isolated from a central electrode by a porcelain insulator. Buy online 24/7 and enjoy our Free Shipping with no minimum purchase offer. If you don't see what you are looking for chat with us anytime. We can help.