{"product_id":"ignition-coil-spark-plugs-for-subaru-wrx-sti-2005-2007-2-5l","title":"Ignition Coil + Spark Plugs for Subaru WRX STI (2005-2007) 2.5L","description":"\u003ch2 style=\"font-size: clamp(18px, 3vw, 21px); margin-bottom: 15px; line-height: 1.3;\"\u003eDirect-Fit Ignition Coil and Spark Plug Kit for 2005-2007 Subaru WRX STI (GD)\u003c\/h2\u003e\n\n\u003cp\u003e\u003cstrong\u003eWhat it Does:\u003c\/strong\u003e The ignition coil and spark plug kit replaces aged factory coil packs and worn plugs on the 2005-2007 WRX STI to eliminate high-boost spark blowout, restore combustion efficiency, and sharpen throttle response.\u003c\/p\u003e\n\n\u003ch3\u003eThe Stock Subaru WRX STI Ignition Thermal Breakdown\u003c\/h3\u003e\n\u003cp\u003eThe horizontal cylinder arrangement of the \u003cstrong\u003eEJ257\u003c\/strong\u003e boxer engine places the ignition coil-on-plug boots in direct proximity to hot cylinder heads and exhaust manifold heat. Over sustained thermal cycling, the internal primary and secondary copper windings within the stock coils suffer dielectric fatigue, leading to secondary voltage decay and micro-arcing. Compounded by widened gaps on eroded spark plugs, the degraded ignition system struggles to ionize dense air-fuel mixtures under manifold boost pressure, manifesting as erratic idle, hesitation, and boost-dependent misfires.\u003c\/p\u003e\n\n\u003ch3\u003eThe Engineering Solution\u003c\/h3\u003e\n\u003cp\u003eThis comprehensive tune-up kit restores high-energy ignition timing to factory operational tolerances. Featuring heavy-duty dielectric epoxy encapsulation and heat-resistant silicone boots, these direct-replacement coils prevent arc-through and resist high-temperature degradation within cramped \u003cstrong\u003eGD\u003c\/strong\u003e chassis engine bays. Paired with fine-wire Denso Iridium spark plugs, the kit lowers ignition voltage requirements while producing a concentrated spark kernel, ensuring reliable flame-front propagation and complete cylinder burn across the entire rev range.\u003c\/p\u003e\n\n\u003ch3\u003eWhat's Included\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e4 Ignition Coils replacement for UF508\u003c\/li\u003e\n  \u003cli\u003e4 Denso Iridium Spark Plugs\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eTechnical Specifications\u003c\/h3\u003e\n\u003cdiv style=\"overflow-x: auto; margin-bottom: 20px;\"\u003e\n  \u003ctable width=\"100%\" style=\"border-collapse: collapse; border: 1px solid #e0e0e0; font-size: 14px; min-width: 300px;\"\u003e\n    \u003ctr style=\"background-color: #f9f9f9;\"\u003e\n\u003cth style=\"padding:10px; text-align: left; border: 1px solid #e0e0e0;\"\u003eFitment\u003c\/th\u003e\n\u003ctd style=\"padding:10px; border: 1px solid #e0e0e0;\"\u003e2005-2007 Subaru WRX STI\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth style=\"padding:10px; text-align: left; border: 1px solid #e0e0e0;\"\u003eEngine \/ Chassis\u003c\/th\u003e\n\u003ctd style=\"padding:10px; border: 1px solid #e0e0e0;\"\u003eEJ257 \/ GD\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr style=\"background-color: #f9f9f9;\"\u003e\n\u003cth style=\"padding:10px; text-align: left; border: 1px solid #e0e0e0;\"\u003eStock Output\u003c\/th\u003e\n\u003ctd style=\"padding:10px; border: 1px solid #e0e0e0;\"\u003e300 hp \/ 300 lb-ft\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth style=\"padding:10px; text-align: left; border: 1px solid #e0e0e0;\"\u003eReplaces OEM Part #\u003c\/th\u003e\n\u003ctd style=\"padding:10px; border: 1px solid #e0e0e0;\"\u003eUF508, C760, GN10484, 32009782, 22443AA540, 22433AA640, 22058\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003c\/table\u003e\n\u003c\/div\u003e\n\n\u003ch3\u003eCompatibility\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e2005 Subaru WRX STI 2.5L turbo\u003c\/li\u003e\n  \u003cli\u003e2006-2007 Subaru WRX STI 2.5L turbo\u003c\/li\u003e\n  \u003cli\u003e2007 Subaru WRX STI Limited 2.5L turbo\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eFrequently Asked Questions \u0026amp; Fitment Warnings\u003c\/h3\u003e\n\u003ch4\u003eDoes this fit the GD WRX STI?\u003c\/h4\u003e\n\u003cp\u003eYes, this is a direct fit for the 2005-2007 Subaru WRX STI equipped with the \u003cstrong\u003eEJ257\u003c\/strong\u003e engine. \u003cstrong\u003eThis kit is not compatible with 2.0L EJ205 WRX engines or naturally aspirated EJ platforms due to differing coil dwell profiles and harness connector configurations.\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003ch4\u003eAre spark plug wires required for installation?\u003c\/h4\u003e\n\u003cp\u003eNo, the \u003cstrong\u003eEJ257\u003c\/strong\u003e utilizes a direct coil-on-plug layout, meaning separate plug wires are not used or included with this kit.\u003c\/p\u003e\n\n\u003ch3\u003eThe Subaru Performance Caliber\u003c\/h3\u003e\n\u003cp\u003eEngineered to handle intense boost pressure and rapid throttle transitions, this direct-fit ignition kit ensures your turbocharged boxer engine delivers uninterrupted power delivery, razor-sharp response, and clean combustion pull after pull.\u003c\/p\u003e","brand":"VelocityMax","offers":[{"title":"Default Title","offer_id":67562511270136,"sku":"DS-E7LD906JL","price":164.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0800\/1290\/2648\/files\/ignition-coil-spark-plugs-for-subaru-wrx-sti-2005-2007-2-5l-1.jpg?v=1790983093","url":"https:\/\/performancechiptuning.com\/products\/ignition-coil-spark-plugs-for-subaru-wrx-sti-2005-2007-2-5l","provider":"Performance Chip Tuning","version":"1.0","type":"link"}