{"product_id":"ngk-iridium-spark-plugs-4-pack-for-subaru-legacy-2-5i-2014-silzkar7b11-iridium-tip-copper-core","title":"NGK Iridium Spark Plugs 4-Pack for Subaru Legacy 2.5i 2014 — SILZKAR7B11, Iridium Tip \u0026 Copper Core","description":"\u003cp\u003e\u003cstrong\u003eNGK Laser Iridium SILZKAR7B11 is a four-pack of OE-engineered iridium spark plugs built to deliver durable, reliable ignition for the 2014 Subaru Legacy 2.5i Sport (2.5L, 2498cc).\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cp\u003eThese NGK spark plugs use a precision iridium firing tip and copper core to balance long service life with efficient heat transfer. Designed to the original equipment specifications for the listed Subaru application, they include corrosion-resistant plating and an extended insulator for optimal spark performance across driving conditions. Sold as a set of four, these plugs replace the factory units without modification.\u003c\/p\u003e\n\n\u003ch3\u003eWhy choose an iridium-tipped plug for my Subaru Legacy?\u003c\/h3\u003e\n\u003cp\u003eIridium is extremely hard and retains a fine, stable firing point much longer than softer metals. That means crisper ignition over time and a longer interval between replacements compared with conventional plugs. NGK pairs the iridium tip with a copper core to ensure efficient heat dissipation while keeping the electrode geometry precise.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eIridium tip for durable, consistent spark\u003c\/li\u003e\n  \u003cli\u003eCopper core improves heat removal and combustion stability\u003c\/li\u003e\n  \u003cli\u003eOE heat range and reach match Subaru factory requirements\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eHow do these plugs affect everyday driving and starting?\u003c\/h3\u003e\n\u003cp\u003eSharper spark generation helps more complete fuel burn, which can improve throttle response and cold starts without changing fuel or engine hardware. Because the electrode maintains its shape longer, drivability remains consistent as the plugs age. They’re resistor-type plugs, so they also reduce radio interference and protect ignition electronics.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eImproved ignition consistency for smoother starts and acceleration\u003c\/li\u003e\n  \u003cli\u003eResistor built-in to minimize electrical interference\u003c\/li\u003e\n  \u003cli\u003eExtended projected insulator for reliable firing across loads\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhat are the fitment and installation details I need to know?\u003c\/h3\u003e\n\u003cp\u003eThese NGK SILZKAR7B11 plugs are specified for the 2014 Subaru Legacy 2.5i Sport with the 2.5L (2498cc) 4-cylinder engine. They use an 18mm thread, a 1.040-inch reach, a gasket seat and a 14mm wrench hex for removal and installation. Because they’re OE-engineered, no gap adjustment or special adaptors are required when replacing the factory plugs.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eThread size: 18mm; reach: 1.040 in (26.4 mm)\u003c\/li\u003e\n  \u003cli\u003eSeat style: gasket; wrench size: 14mm\u003c\/li\u003e\n  \u003cli\u003eSold as a 4-pack—one plug per cylinder in this engine\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eHow long can I expect these plugs to last and what maintenance is needed?\u003c\/h3\u003e\n\u003cp\u003eIridium tips resist wear much longer than standard electrodes, so replacement intervals are extended under normal driving. Regular inspection during tune-ups will reveal deposits or pre-ignition signs; otherwise change intervals follow manufacturer recommendations or diagnostic indications. Proper torque at installation and clean threads help prevent corrosion and ensure longevity.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eIridium tip extends service life compared to conventional plugs\u003c\/li\u003e\n  \u003cli\u003eCorrugated insulator ribs and trivalent plating resist flashover and seizing\u003c\/li\u003e\n  \u003cli\u003eInspect at scheduled maintenance; replace as recommended by vehicle guidelines\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eWho is this for: This NGK Laser Iridium SILZKAR7B11 4-pack is aimed at owners or technicians maintaining a 2014 Subaru Legacy 2.5i Sport with the 2.5L 4-cylinder engine who want an OEM-compatible, longer-lasting ignition component. It’s appropriate for routine replacement during scheduled service, performance-conscious drivers seeking consistent ignition over time, and anyone who prefers factory-specified parts for fit and reliability.\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: Are these NGK plugs the correct fit for a 2014 Subaru Legacy 2.5i Sport?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: Yes. SILZKAR7B11 is specified for the 2014 Legacy 2.5i Sport (2.5L\/2498cc) with the correct thread, reach, and seat style.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: Do these spark plugs require a gap adjustment?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: No gap adjustment is typically required; they are OE-engineered to the correct gap and reach for the listed Subaru application.\u003c\/p\u003e\n\u003c\/div\u003e\u003c\/section\u003e","brand":"NGK","offers":[{"title":"Default Title","offer_id":55161249300823,"sku":"B07T6C2LD4","price":100.71,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1050\/1524\/7191\/files\/ngk-laser-iridium-front-pack.jpg?v=1790323166","url":"https:\/\/britishgarage.co.uk\/products\/ngk-iridium-spark-plugs-4-pack-for-subaru-legacy-2-5i-2014-silzkar7b11-iridium-tip-copper-core","provider":"British Garage","version":"1.0","type":"link"}