--- product_id: 261588337 title: "Iridium IX Spark Plug LFR7AIX # 2309 PK4" brand: "ngk" price: "339 zł" currency: PLN in_stock: true category: "Ngk" url: https://www.desertcart.pl/products/261588337-iridium-ix-spark-plug-lfr7aix-2309-pk4 store_origin: PL region: Poland --- # Corrugated ribs prevent flashover Iridium core for max ignition power Trivalent plating resists corrosion & seizing Iridium IX Spark Plug LFR7AIX # 2309 PK4 **Brand:** ngk **Price:** 339 zł **Availability:** ✅ In Stock ## Summary > ⚡ Ignite your drive with NGK Iridium IX – where power meets precision! ## Quick Answers - **What is this?** Iridium IX Spark Plug LFR7AIX # 2309 PK4 by ngk - **How much does it cost?** 339 zł with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.pl](https://www.desertcart.pl/products/261588337-iridium-ix-spark-plug-lfr7aix-2309-pk4) ## Best For - ngk enthusiasts ## Why This Product - Trusted ngk brand quality - Free international shipping included - Worldwide delivery with tracking - 15-day hassle-free returns ## Key Features - • **Thermal Mastery:** Pure alumina silicate ceramic insulator enhances heat transfer and structural strength. - • **Flashover Defense:** Innovative corrugated ribs eliminate misfires by preventing flashover. - • **Unmatched Durability:** Trivalent metal plating ensures long-lasting corrosion and seizing resistance. - • **Precision Ignition Boost:** Iridium core delivers ultra-fine sparks for superior combustion efficiency. - • **Optimized Heat Dissipation:** Copper core rapidly removes heat to maintain peak performance under pressure. ## Overview NGK Iridium IX Spark Plug LFR7AIX #2309 PK4 is a premium automotive ignition component featuring an iridium core for enhanced spark efficiency, trivalent metal plating for superior corrosion resistance, and corrugated ribs to prevent flashover. Designed with a pure alumina silicate ceramic insulator and copper core, it ensures optimal heat transfer and durability, making it a top choice for car and truck engines seeking reliable performance and longevity. ## Description 4 PCS *NEW* -- NGK 2309 Iridium Spark Plugs LFR7AIX --- Made IN Japan ## Features - Trivalent metal plating provides superior anti-corrosion and anti-seizing properties - Corrugated ribs prevent flashover - Pure alumina silicate ceramic insulator, provides superior strength and better heat transfer - Copper core aids in heat removal ## Technical Specifications | Specification | Value | |---------------|-------| | ASIN | B003RYMPUY | | Automotive Fit Type | Vehicle Specific Fit | | Best Sellers Rank | #4,935 in Automotive ( See Top 100 in Automotive ) #9 in Automotive Performance Spark Plugs | | Brand Name | NGK | | Compatible with Vehicle Type | Car, Truck | | Core Material | Iridium | | Customer Reviews | 4.7 4.7 out of 5 stars (429) | | Gap Size | 0.04 Inches | | Included Components | 2309 | | Item Weight | 0.01 Ounces | | Manufacturer | NGK | | Manufacturer Part Number | LFR7AIX | | Model Number | 2309 | | OEM Equivalent Part Number | FORD%1505812 | | Thread Size | 14mm x 1.25mm | | Top Material Type | iridium | | UPC | 087295023099 | | Unit Count | 4 Count | ## Product Details - **Brand:** NGK - **Core material:** Iridium - **Thread size:** 14mm x 1.25mm - **Top material type:** iridium - **Vehicle service type:** Car, Truck ## Images ![Iridium IX Spark Plug LFR7AIX # 2309 PK4 - Image 1](https://m.media-amazon.com/images/I/71hclq6PseL.jpg) ## Questions & Answers **Q: Will these fit a 2009 subaru wrx?** A: Yes these will fit as i also use them in my 2009 wrx. Do not use unless you are at a minimum of 100 hp over stock though as it could hurt performance and fuel economy. These are NOT pre gapped for our Subaru WRX . Take your time and gap these plugs . Do not gap below .024 . I run a built motor and even before that i was pro tuned on both 91,93 and E85. Full bolt ons , headers, fuel pump, intake, hks blow off, blouch 20 G turbo and full 3 in back exhaust. Hybrid speed density . I still run them at .026 gap. Works very well for me. **Q: Will this fit on the 2006 mitsubishi evo 9 mr?** A: Yea **Q: Are these one step colder ?** A: Yes these are 1 heat range colder **Q: Can I return these plugs? They were too long for my Subaru.** A: Sure you can. ## Frequently Bought Together - NGK Iridium IX Spark Plug LFR7AIX # 2309 PK4 - MOTUL 8100 X-Cess Gen 2 SAE 5W40 Full Synthetic Motor Engine Oil 5 Liter Bottle - Subaru Engine Oil Filter & Crush Gasket KIT 15208AA100 & 11126AA000 Genuine Legacy Outback Impreza Wrx STi Forester Baja (1 Pack) --- ## Why Shop on Desertcart? - 🛒 **Trusted by 1.3+ Million Shoppers** — Serving international shoppers since 2016 - 🌍 **Shop Globally** — Access 737+ million products across 21 categories - 💰 **No Hidden Fees** — All customs, duties, and taxes included in the price - 🔄 **15-Day Free Returns** — Hassle-free returns (30 days for PRO members) - 🔒 **Secure Payments** — Trusted payment options with buyer protection - ⭐ **TrustPilot Rated 4.5/5** — Based on 8,000+ happy customer reviews **Shop now:** [https://www.desertcart.pl/products/261588337-iridium-ix-spark-plug-lfr7aix-2309-pk4](https://www.desertcart.pl/products/261588337-iridium-ix-spark-plug-lfr7aix-2309-pk4) --- *Product available on Desertcart Poland* *Store origin: PL* *Last updated: 2026-05-27*