{"product_id":"ignition-coil-and-iridium-spark-plugs-for-subaru-wrx-sti-2015-2021-2-5l","title":"Ignition Coil and Iridium Spark Plugs for Subaru WRX STI (2015-2021) 2.5L","description":"\u003ch2\u003eHigh-Output Ignition Coil and Iridium Spark Plugs for 2015-2021 Subaru WRX STI\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003eDirect OEM replacement ignition system designed to restore spark energy and eliminate misfires on tuned or aging EJ257 engines.\u003c\/strong\u003e\u003c\/p\u003e\n\u003ch3\u003eThe Stock WRX STI Ignition Weakness\u003c\/h3\u003e\n\u003cp\u003eThe factory ignition coils on the EJ257 degrade rapidly under high boost and thermal stress. As the VA chassis ages, coil packs often suffer from internal resistance breakdown and cracked epoxy housings due to persistent heat soak from the turbocharged boxer layout. This leads to weak spark propagation, hesitation during wide-open throttle, high-RPM misfires, and reduced fuel efficiency. Standard spark plug electrodes also erode faster in forced-induction environments, widening the plug gap over time and causing spark blowout under peak manifold pressure.\u003c\/p\u003e\n\u003ch3\u003eThe Engineering Solution\u003c\/h3\u003e\n\u003cp\u003eThis comprehensive kit provides four high-voltage ignition coils and four iridium-tipped spark plugs tailored for the 2.5L turbo engine. The ignition coils feature upgraded copper windings and high-dielectric epoxy resin to resist thermal breakdown and ensure consistent voltage output. Paired with iridium spark plugs, which utilize an ultra-fine center electrode for superior ignitability and a high melting point to withstand extreme combustion chamber temperatures, this setup guarantees a highly stable spark. The result is complete combustion, restored throttle response, and the elimination of boost-induced spark blowout.\u003c\/p\u003e\n\u003ch3\u003eTechnical Specifications\u003c\/h3\u003e\n\u003ctable width=\"100%\" style=\"border-collapse: collapse; border: 1px solid #e0e0e0; font-size: 14px;\"\u003e\n\u003ctr style=\"background-color: #f9f9f9;\"\u003e\n\u003ctd style=\"padding:8px;\"\u003e\u003cstrong\u003eFitment\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:8px;\"\u003e2015-2021 Subaru WRX STI\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding:8px;\"\u003e\u003cstrong\u003eEngine \/ Chassis\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:8px;\"\u003eEJ257 \/ VA\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background-color: #f9f9f9;\"\u003e\n\u003ctd style=\"padding:8px;\"\u003e\u003cstrong\u003eStock Output\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:8px;\"\u003e305-310 hp \/ 290 lb-ft (Approx)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding:8px;\"\u003e\u003cstrong\u003ePart Number\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:8px;\"\u003eUF665, 22433AA602, 93893\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\n\u003ch3\u003eCompatibility\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e2015 Subaru WRX STI 2.5L Turbo (EJ257)\u003c\/li\u003e\n\u003cli\u003e2016 Subaru WRX STI 2.5L Turbo (EJ257)\u003c\/li\u003e\n\u003cli\u003e2017 Subaru WRX STI 2.5L Turbo (EJ257)\u003c\/li\u003e\n\u003cli\u003e2018 Subaru WRX STI 2.5L Turbo (EJ257)\u003c\/li\u003e\n\u003cli\u003e2019 Subaru WRX STI 2.5L Turbo (EJ257)\u003c\/li\u003e\n\u003cli\u003e2020 Subaru WRX STI 2.5L Turbo (EJ257)\u003c\/li\u003e\n\u003cli\u003e2021 Subaru WRX STI 2.5L Turbo (EJ257)\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eThe Subaru Standard\u003c\/h3\u003e\n\u003cp\u003eFor high-performance JDM platforms like the VA STI, maintaining robust spark energy is critical for sustained power delivery and that signature boxer rumble. This ignition kit ensures reliable timing and maximum combustion efficiency under heavy loads.\u003c\/p\u003e","brand":"VelocityMax","offers":[{"title":"Default Title","offer_id":50255526756600,"sku":"DS-ELRU3JWLV","price":99.95,"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-wrx-sti-2015-2021-2-5l-1.webp?v=1787983242","url":"https:\/\/performancechiptuning.com\/fr\/products\/ignition-coil-and-iridium-spark-plugs-for-subaru-wrx-sti-2015-2021-2-5l","provider":"Performance Chip Tuning","version":"1.0","type":"link"}