Your spark plug is basically a health report for your engine. Pull one plug and you can learn a lot, things a scanner wouldn't be able to tell you. Light Vibrating Smart Ring for Men Vibration Notifications Health Monitoring,Calls Messages, Slient Alarm Clock Rings for Android iOS AliExpress 44 HiOSTip Flip your phone to mute the ringer and stop incoming calls from vibrating or ringing out loud. HiOS Flip Mute feature helps you to silent an incoming call just by flipping WHY SOME CARS USE TWIN SPARK IGNITION SYSTEMS Ever wondered why some engines have two spark plugs per cylinder instead of one? That's the magic of a twin spark ignition system, designed to