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Ultra Fine Electrode By harnessing the power of Iridium, DENSO is suddenly able to shrink the surface area of the center electrode - the critical component of a spark plug. Unlike a typical platinum plug that has a 1.1mm diameter center electrode, DENSO Iridium Power plugs have the world's smallest center electrode measuring 0.4mm in diameter. This means that the voltage requirements are decreased while firing performance is greatly improved.Fits:Porsche 911 Carrera 2.7 RS 09/1972-08/1975 (kW 154)Porsche 911 Turbo 3.3L 10/1977-08-1989 (kW 221; Engine 930.60 - 930.66)
