{"product_id":"ngk-iridium-ix-spark-plugs-lfr5aix-11-6-pack-iridium-tip-pre-gapped-044-for-v6-engines","title":"NGK Iridium IX Spark Plugs LFR5AIX-11 (6 Pack) — Iridium Tip, Pre-Gapped .044\" for V6 Engines","description":"\u003cp\u003e\u003cstrong\u003eNGK 4469 Iridium IX spark plugs (LFR5AIX-11) are high-performance iridium-tipped replacement plugs sold in a 6-pack and engineered for reliable ignition, improved throttle response, and long service life.\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cp\u003eThese LFR5AIX-11 plugs combine a fine-wire iridium center electrode, copper core, and ceramic insulator to deliver consistent sparks across many late-model 6-cylinder engines. Designed with a taper-cut nickel ground electrode and a precise pre-gap of 0.044\" (1.1 mm), they suit fuel-injected and turbocharged applications where stable combustion, reduced misfires, and extended wear life matter. Each plug includes a crush washer and a non-removable nut electrical terminal for straightforward installation and dependable connection.\u003c\/p\u003e\n\n\u003ch3\u003eHow do these plugs improve everyday driving?\u003c\/h3\u003e\n\u003cp\u003eIridium’s fine-wire center electrode needs less voltage to produce a strong spark, which helps ignition happen more cleanly and consistently. That typically translates to crisper throttle response and smoother idle, especially in engines that operate under variable loads.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eFine-wire iridium tip for consistent ignition and lower voltage demand.\u003c\/li\u003e\n  \u003cli\u003eCopper core for efficient heat transfer and stable operating temperature.\u003c\/li\u003e\n  \u003cli\u003ePre-gapped to 0.044\" for immediate fitment in compatible engines.\u003c\/li\u003e\n  \u003cli\u003ePrecision laser construction for predictable spark location and timing.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eAre these plugs durable for long service intervals?\u003c\/h3\u003e\n\u003cp\u003eYes — iridium tips combined with a corrosion-resistant nickel ground electrode and ceramic insulator extend usable life compared with standard copper plugs. They are engineered to maintain gap integrity and resist wear, lowering the need for frequent replacement in many driving conditions.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eIridium tip resists erosion for longer service life.\u003c\/li\u003e\n  \u003cli\u003eResistor built in to reduce radio-frequency interference and protect electronics.\u003c\/li\u003e\n  \u003cli\u003eCrush washer ensures a proper seal at each installation.\u003c\/li\u003e\n  \u003cli\u003eMid-projection design balances combustion chamber access and heat control.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhich vehicles and engine types fit this NGK part number?\u003c\/h3\u003e\n\u003cp\u003eThe NGK LFR5AIX-11 (stock number 4469) fits a range of 6-cylinder engines across several makes when a 14 mm thread and 26.5 mm reach are specified. Common compatible applications include select Hyundai, Infiniti, Kia, Nissan, Suzuki, and Toyota 3.5L or 4.0L V6\/6-cylinder engines from model years listed by manufacturers.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eThread diameter: 14.0 mm; reach: 26.5 mm (1.043\" reach).\u003c\/li\u003e\n  \u003cli\u003eHeat range: NGK manufacturer rating 5 for moderate operating temperatures.\u003c\/li\u003e\n  \u003cli\u003eSeat type: flat with crush washer included for correct gasket seating.\u003c\/li\u003e\n  \u003cli\u003eHex size: 5\/8\" (16 mm) for standard socket use during install.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhat should I know about installation and maintenance?\u003c\/h3\u003e\n\u003cp\u003eThese plugs come pre-gapped to 0.044\" but always verify gap and torque to vehicle manufacturer specifications before final installation. Use the recommended torque and a clean thread surface; replace plugs in the full set to preserve ignition balance and engine smoothness.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eVerify pre-gap 0.044\" and adjust only if OEM specs differ.\u003c\/li\u003e\n  \u003cli\u003eTorque to vehicle-specific values to avoid thread or sealing damage.\u003c\/li\u003e\n  \u003cli\u003eReplace all plugs at once for even engine performance.\u003c\/li\u003e\n  \u003cli\u003eInspect ignition coils and boots while servicing for leaks or wear.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eWho is this for: Drivers and technicians seeking a durable, OEM-compatible performance spark plug for late-model 6-cylinder Hyundai, Infiniti, Kia, Nissan, Suzuki, and Toyota engines. Choose the NGK 4469 Iridium IX LFR5AIX-11 6-pack when you want a long-life iridium center electrode, precise construction, and straightforward fitment for models that call for a 14 mm thread, 26.5 mm reach, and a 0.044\" gap.\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: What gap are NGK LFR5AIX-11 plugs pre-set to?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: They are pre-gapped to 0.044 inches (1.1 mm); verify against your vehicle specs before installing.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: Will these plugs fit my 2005 Nissan 350Z 3.5L?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: Yes, NGK 4469 LFR5AIX-11 is compatible with 2003–2006 Nissan 350Z 3.5L engines requiring a 14 mm thread and 26.5 mm reach.\u003c\/p\u003e\n\u003c\/div\u003e\u003c\/section\u003e","brand":"NGK","offers":[{"title":"Default Title","offer_id":55169135771991,"sku":"B00330AMYS","price":64.04,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1050\/1524\/7191\/files\/ngk-4469-front-packaging.jpg?v=1790419238","url":"https:\/\/britishgarage.co.uk\/products\/ngk-iridium-ix-spark-plugs-lfr5aix-11-6-pack-iridium-tip-pre-gapped-044-for-v6-engines","provider":"British Garage","version":"1.0","type":"link"}