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How to select the best spark plug for your modified or turbo engine. Here you will know if you need a hot or cold plug. You will also be able to know if they are working well or you need to select a different one. Find me at: / tunedbyrulo http://www.tunedbyrulo.com #TunedbyRulo #Sparkplugs #Tuning #ColdSparkplugs #HotSparkplugs #TuningTips #NGK