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The DENSO Iridium TT spark plug (part code IW16TT) is designed to deliver exceptional ignition performance. Featuring a unique Iridium-TT alloy, these plugs provide enhanced durability and a longer service life compared to conventional spark plugs. These spark plugs are engineered for optimal combustion, ensuring a strong spark and efficient fuel burn. This translates to improved engine performance, better fuel economy, and reduced emissions. The advanced design helps maintain consistent performance over time, even under demanding driving conditions. DENSO's Iridium TT technology represents a significant advancement in ignition systems. They are a reliable choice for drivers seeking to maintain or enhance their vehicle's performance and efficiency with a high-quality spark plug.