{"product_id":"ignition-coil-and-iridium-spark-plugs-for-subaru-forester-2004-2009-2-5l","title":"Ignition Coil and Iridium Spark Plugs for Subaru Forester (2004-2009) 2.5L","description":"\u003ch2\u003eDirect-Fit Ignition Coil and Iridium Spark Plug Kit for 2004-2009 Subaru Forester\u003c\/h2\u003e\n\n\u003cp\u003e\u003cstrong\u003eWhat it Does:\u003c\/strong\u003e The Ignition Coil and Iridium Spark Plug Kit replaces degraded factory secondary ignition components on the 2004-2009 Subaru Forester to restore combustion efficiency, eliminate cylinder misfires, and stabilize idle quality.\u003c\/p\u003e\n\n\u003ch3\u003eThe Stock Subaru Forester Thermal Breakdown Vulnerability\u003c\/h3\u003e\n\u003cp\u003eThe horizontally opposed layout of the \u003cstrong\u003eEJ25\u003c\/strong\u003e places the coil-on-plug modules and spark plugs in extreme proximity to the cylinder heads and exhaust manifold heat shields. Over operational cycles, severe engine bay heat soak degrades the internal copper windings and dielectric epoxy of the factory coil packs. This thermal stress causes micro-fissuring in the silicone insulation boots, resulting in secondary voltage leakage to the cylinder head wall, elevated resistance, and erratic spark delivery under heavy engine load. Concurrently, standard electrode erosion on aging plugs widens the gap, placing excessive electrical strain on the coils and triggering P0300 through P0304 diagnostic trouble codes.\u003c\/p\u003e\n\n\u003ch3\u003eThe Engineering Solution\u003c\/h3\u003e\n\u003cp\u003eThis comprehensive tune-up kit features heavy-duty coil packs wound with high-conductivity copper magnetic wire encased in thermal-resistant dielectric resin to withstand sustained head temperatures. The paired fine-wire \u003cstrong\u003eIridium\u003c\/strong\u003e spark plugs utilize a high-melting-point laser-welded electrode tip, requiring lower firing voltage while projecting a stable, concentrated plasma kernel into the combustion chamber. Engineered as a direct drop-in solution matching OEM resistance specifications, this kit restores rapid flame-front propagation, sharpens throttle response, and shields against high-temperature voltage tracking across the entire \u003cstrong\u003eSG\u003c\/strong\u003e and \u003cstrong\u003eSH\u003c\/strong\u003e generation engine cycles.\u003c\/p\u003e\n\n\u003ch3\u003eTechnical Specifications\u003c\/h3\u003e\n\u003ctable width=\"100%\" style=\"border-collapse: collapse; border: 1px solid #e0e0e0; font-size: 14px; margin-bottom: 20px;\"\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;\"\u003e2004-2009 Subaru Forester\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;\"\u003eEJ25 2.5L H4 \/ SG, SH\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;\"\u003e173 hp \/ 166 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;\"\u003e22433AA418, 22433AA480, UF508, UF567, 32010633, 32011222\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\n\n\u003ch3\u003eCompatibility\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e2004-2008 Subaru Forester 2.5L H4 (SG Chassis, EJ25)\u003c\/li\u003e\n  \u003cli\u003e2009 Subaru Forester 2.5L H4 (SH Chassis, EJ25)\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eDoes this fit the SG and SH Forester?\u003c\/strong\u003e\u003cbr\u003e Yes, this is a direct fit for the 2004-2009 Subaru Forester equipped with the \u003cstrong\u003eEJ25\u003c\/strong\u003e 2.5L engine.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eDo the iridium spark plugs come pre-gapped for the EJ25?\u003c\/strong\u003e\u003cbr\u003e Yes, the plugs are factory-gapped to OEM clearance specifications, though verifying gap with a non-contact gauge prior to install is recommended.\u003c\/p\u003e\n\n\u003ch3\u003eThe Subaru Boxer Reliability Standard\u003c\/h3\u003e\n\u003cp\u003eBoxer-engine powertrains demand exact ignition timing and uncompromised secondary voltage to maintain balance and eliminate low-RPM hesitation. Built for rigorous all-weather driving and prolonged thermal resistance, this ignition package delivers the uncompromised combustion consistency required by Subaru AWD platforms.\u003c\/p\u003e","brand":"VelocityMax","offers":[{"title":"Default Title","offer_id":50593986642168,"sku":"DS-ENPD457T3","price":84.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0800\/1290\/2648\/files\/ignition-coil-and-iridium-spark-plugs-for-subaru-forester-2004-2009-2-5l-1.jpg?v=1790055207","url":"https:\/\/performancechiptuning.com\/products\/ignition-coil-and-iridium-spark-plugs-for-subaru-forester-2004-2009-2-5l","provider":"Performance Chip Tuning","version":"1.0","type":"link"}