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Message: <blockquote data-quote="ichiwan2" data-source="post: 40421" data-attributes="member: 153">Good stuff.  The sparks are more consistent due to the fine tip (make sure its the 0.4mm tip). Better than splitfire.  Splitfire is makes my engine sound rough.  Best ones I used before were plasma plugs, made by Kidc, the same people that make Cyclone.  Couldn't use plasma plugs on my e21 as it got fouled by oil leaking into one of the combustion chambers.  It ran perfectly with my Citroen, reduced engine noise.  Don't know if its still available.Benefits of iridium plugs are as per kevster's comments.Pls note that there is a long-life version with a 0.7mm tip.  Not as efficient tho.I am lucky that my m20 uses only six plugs.  Think about those with twin spark plugs, like alfa romeo and porche.  very painful if wanna change to iridiums.</blockquote>