{"product_id":"ngk-ilfr7h-iridium-spark-plugs-subaru-ej25-set-of-4","title":"ILFR7H Iridium Spark Plugs – Subaru EJ25 Set of 4","description":"\u003cp data-start=\"62\" data-end=\"255\"\u003eThe NGK ILFR7H is a colder heat range spark plug built for turbo EJ25 setups that see real load. If you’re running more boost, more timing, or more heat than stock, this is the right direction.\u003c\/p\u003e\n\u003chr data-start=\"557\" data-end=\"560\"\u003e\n\u003ch3 data-start=\"562\" data-end=\"586\"\u003eWhy This Setup Works\u003c\/h3\u003e\n\u003cp data-start=\"588\" data-end=\"660\"\u003eCylinder pressure and heat go up fast once you start leaning on an EJ25.\u003c\/p\u003e\n\u003cp data-start=\"662\" data-end=\"917\"\u003eA colder heat range 7 plug transfers heat out of the tip more efficiently, helping reduce the chance of pre-ignition and knock in higher-load conditions. That matters on older EJ25 engines where ringlands and detonation tolerance aren’t exactly forgiving.\u003c\/p\u003e\n\u003cp data-start=\"919\" data-end=\"1106\"\u003eThe fine-wire iridium electrode maintains a strong, consistent spark under boost while resisting erosion over time. It’s stable, predictable, and well suited for tuned turbo applications.\u003c\/p\u003e\n\u003cp data-start=\"1108\" data-end=\"1266\"\u003eThese come factory gapped for standard setups. As always, verify gap based on boost level and calibration strategy—but you’re starting from a proper baseline.\u003c\/p\u003e\n\u003chr data-start=\"1268\" data-end=\"1271\"\u003e\n\u003ch3 data-start=\"1273\" data-end=\"1291\"\u003eIdeal Use Case\u003c\/h3\u003e\n\u003cp data-start=\"1293\" data-end=\"1450\"\u003e• Tuned EJ25 street cars\u003cbr data-start=\"1317\" data-end=\"1320\"\u003e• Higher-boost turbo setups\u003cbr data-start=\"1347\" data-end=\"1350\"\u003e• Ethanol or flex-fuel builds\u003cbr data-start=\"1379\" data-end=\"1382\"\u003e• Track-driven Subarus\u003cbr data-start=\"1404\" data-end=\"1407\"\u003e• OEM replacement for Type RA engine cars\u003c\/p\u003e\n\u003cp data-start=\"1452\" data-end=\"1539\"\u003eIf you’re increasing cylinder pressure, stepping one heat range colder is a smart move. EJ25 owners looking for a colder spark plug that holds up under boost, the NGK ILFR7H is a solid choice.\u003c\/p\u003e","brand":"NGK","offers":[{"title":"Default Title","offer_id":43116825673771,"sku":null,"price":77.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0668\/1817\/9115\/files\/ngk-laser-iridium-spark-plug-set-2006-2014-wrx-2004-2021-sti-2005-2009-lgt-2004-2013-fxt-5245-129728_1020x1020_8c65ebd6-71de-4ecd-911b-0954fde95338.webp?v=1772434469","url":"https:\/\/www.red5garage.com\/products\/ngk-ilfr7h-iridium-spark-plugs-subaru-ej25-set-of-4","provider":"Red 5 Garage","version":"1.0","type":"link"}