{"product_id":"ngk-laser-iridium-spark-plugs-for-subaru-legacy-2-5l-silzkar7b11-4-pack-iridium-tip-copper-core","title":"NGK Laser Iridium spark plugs for Subaru Legacy 2.5L — SILZKAR7B11 4-pack, iridium tip \u0026 copper core","description":"\u003cp\u003e\u003cstrong\u003eNGK Laser Iridium SILZKAR7B11 spark plugs deliver precise ignition, long service life, and OE-level fitment for the 2014 Subaru Legacy 2.5i.\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cp\u003eThese NGK Laser Iridium spark plugs are designed to match original equipment specifications for the Subaru Legacy 2.5i (2.5L\/2498cc) and combine an ultra-hard iridium firing tip with a copper core for dependable performance and efficient heat transfer. The extended projected insulator and gasket seat provide consistent combustion characteristics, while trivalent metal plating and corrugated ribs resist corrosion and flashover. Sold as a 4-pack, this set covers all cylinders for a straightforward replacement.\u003c\/p\u003e\n\n\u003ch3\u003eHow do these plugs improve ignition consistency?\u003c\/h3\u003e\n\n\u003cp\u003eThe fine iridium firing tip offers a concentrated spark that helps reliable combustion across operating conditions without changing engine management. NGK pairs the iridium tip with a copper core to move heat away from the electrode, supporting steady performance over time.\u003c\/p\u003e\n\n\u003cul\u003e\n  \u003cli\u003eIridium electrode tip — extremely hard and maintains sharpness longer\u003c\/li\u003e\n  \u003cli\u003eCopper core — improves heat dissipation and operational stability\u003c\/li\u003e\n  \u003cli\u003ePlatinum pad on ground electrode — evens wear in DIS systems\u003c\/li\u003e\n  \u003cli\u003eExtended projected insulator — promotes repeatable spark location\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWill these fit my 2014 Subaru Legacy 2.5i and how do they match OE specs?\u003c\/h3\u003e\n\n\u003cp\u003eYes — the SILZKAR7B11 is engineered for the 2.5L Legacy 2014 model, matching original equipment dimensions and thread size so installation is direct. The 18mm thread, 1.040 in reach, gasket seat, and 14mm wrench hex follow manufacturer fitment requirements for a correct seal and reliable torque during installation.\u003c\/p\u003e\n\n\u003cul\u003e\n  \u003cli\u003eThread size: 18mm — matches factory cylinder head thread\u003c\/li\u003e\n  \u003cli\u003eReach: 1.040 in — correct sealing depth for Legacy 2.5L combustion chamber\u003c\/li\u003e\n  \u003cli\u003eSeat style: gasket — ensures proper sealing and heat transfer\u003c\/li\u003e\n  \u003cli\u003eWrench diameter: 14mm — standard tool size for removal\/installation\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eHow long will these spark plugs last and what maintenance should I expect?\u003c\/h3\u003e\n\n\u003cp\u003eIridium tips are far more wear-resistant than conventional electrodes, extending service intervals compared with copper-only plugs. Lifespan depends on driving conditions and engine tune; inspect plugs at manufacturer-recommended intervals and replace as a set to maintain balanced performance.\u003c\/p\u003e\n\n\u003cul\u003e\n  \u003cli\u003eIridium tip hardness — resists erosion for longer operational life\u003c\/li\u003e\n  \u003cli\u003ePlatinum ground pad — promotes even wear in DIS ignition systems\u003c\/li\u003e\n  \u003cli\u003eTriple seals and alumina-silicate ceramic — prevent leakage and cracking\u003c\/li\u003e\n  \u003cli\u003eSold in 4-pack — replace all cylinders simultaneously for uniformity\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eAre there installation or compatibility considerations I should know?\u003c\/h3\u003e\n\n\u003cp\u003eInstallation follows standard spark plug replacement steps: disconnect battery, remove ignition coils, use a torque wrench to spec, and gap-check if needed. These plugs include a resistor and are not marked as 'shorty', so verify clearance with coil boots and confirm heat range 7 suits your engine and climate conditions.\u003c\/p\u003e\n\n\u003cul\u003e\n  \u003cli\u003eResistor type plug — compatible with modern ignition systems\u003c\/li\u003e\n  \u003cli\u003eHeat range: 7 — factory-engineered range for the specified application\u003c\/li\u003e\n  \u003cli\u003eGround strap quantity: one — standard electrode configuration\u003c\/li\u003e\n  \u003cli\u003eInspect coil boot clearance before final torque\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eWho is this for: Drivers and independent mechanics who own or service a 2014 Subaru Legacy 2.5i and want an OE-equivalent replacement that balances long life, dependable ignition, and easy fitment. It’s suited for owners seeking improved durability over standard copper plugs without altering engine calibration, and for anyone performing scheduled maintenance who prefers to replace all four cylinders at once.\u003c\/p\u003e\n\u003csection class=\"product-faq-snippet\"\u003e\u003ch3\u003eFAQ\u003c\/h3\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: Is this NGK plug a direct fit for Subaru Legacy 2.5i 2014?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: Yes. The SILZKAR7B11 matches OE thread, reach, and seat style for the 2014 Legacy 2.5i.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: How often should I replace these iridium spark plugs?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: Service intervals vary; many iridium plugs last significantly longer than copper—inspect at manufacturer-recommended intervals and replace as a set.\u003c\/p\u003e\n\u003c\/div\u003e\u003c\/section\u003e","brand":"NGK","offers":[{"title":"Default Title","offer_id":48082849955998,"sku":"B07T6C2LD4","price":120.17,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0781\/2041\/9486\/files\/ngk-laser-iridium-silzkar7b11-front-packaging.jpg?v=1785816283","url":"https:\/\/northtrailauto.ca\/products\/ngk-laser-iridium-spark-plugs-for-subaru-legacy-2-5l-silzkar7b11-4-pack-iridium-tip-copper-core","provider":"North Trail Auto","version":"1.0","type":"link"}