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Denso Iridium Power Spark Plug IY27 / 5401 Replaces 267700-4500 ER9EH Low required voltage and a high ignitability, resulting in less misfiring and no spark which dramatically improves combustion. Significantly improved combustion enables engine output to increase.The power produced by the 0.4mm electrode is unmatched by any other plugs.The excellent ignitability of Iridium Powers 0.4mm fine electrode draws out much more performance from the engine and tests show fuel consumption improves by around 5%. Low required voltage Better acceleration response and operational stability Lower fuel consumption Longer lifetime DIMENSIONS: Height (mm): 24.5 Width (mm): 24.5 Length (mm): 85 If you are unsure as to whether this is the correct part for your vehicle, please don't hesitate to contact us. Alternatively please use the cross reference table above.