{"product_id":"bull-boost-performance-performance-cylinder-4-coolant-mod-for-subaru-wrx-sti-ej20-ej25-engines","title":"BULL BOOST PERFORMANCE Performance Cylinder 4 Coolant Mod for Subaru WRX STI EJ20\/EJ25 Engines","description":"\u003ch2 data-section-id=\"1hcio6m\" data-start=\"0\" data-end=\"97\"\u003eBULL BOOST PERFORMANCE Performance Cylinder 4 Coolant Mod for Subaru WRX STI EJ20\/EJ25 Engines\u003c\/h2\u003e\n\u003cp data-start=\"99\" data-end=\"128\"\u003e\u003cstrong data-start=\"99\" data-end=\"128\"\u003ePart Number: 720053572377\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp data-start=\"130\" data-end=\"417\"\u003eImprove cooling balance across your Subaru EJ engine with the BULL BOOST PERFORMANCE Cylinder 4 Coolant Mod. Designed to increase coolant flow specifically to cylinder #4, this upgrade helps reduce localized hot spots and promotes more even temperature distribution across all cylinders.\u003c\/p\u003e\n\u003cp data-start=\"419\" data-end=\"671\"\u003eBy improving coolant flow to cylinder 4, this modification helps reduce the risk of knock and detonation—two common contributors to EJ-series engine failures such as ringland damage. Ideal for performance builds, track cars, and modified daily drivers.\u003c\/p\u003e\n\u003ch2 data-section-id=\"1d7mrtu\" data-start=\"673\" data-end=\"684\"\u003eFeatures\u003c\/h2\u003e\n\u003cul data-start=\"685\" data-end=\"971\"\u003e\n\u003cli data-section-id=\"1ufu6d9\" data-start=\"685\" data-end=\"730\"\u003eDirect coolant flow upgrade for cylinder #4\u003c\/li\u003e\n\u003cli data-section-id=\"y21j87\" data-start=\"731\" data-end=\"777\"\u003eHelps reduce cylinder 4 coolant temperatures\u003c\/li\u003e\n\u003cli data-section-id=\"1xb790m\" data-start=\"778\" data-end=\"834\"\u003ePromotes more even engine cooling across all cylinders\u003c\/li\u003e\n\u003cli data-section-id=\"qxuq35\" data-start=\"835\" data-end=\"873\"\u003eReduces risk of knock and detonation\u003c\/li\u003e\n\u003cli data-section-id=\"1d0xxhy\" data-start=\"874\" data-end=\"935\"\u003eImproves long-term engine reliability in tuned applications\u003c\/li\u003e\n\u003cli data-section-id=\"b0ofjo\" data-start=\"936\" data-end=\"971\"\u003eSimple bolt-on style installation\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2 data-section-id=\"1dixaz0\" data-start=\"973\" data-end=\"983\"\u003eFitment\u003c\/h2\u003e\n\u003cp data-start=\"984\" data-end=\"1025\"\u003eCompatible with Subaru EJ-series engines:\u003c\/p\u003e\n\u003cul data-start=\"1027\" data-end=\"1056\"\u003e\n\u003cli data-section-id=\"1uhe3o8\" data-start=\"1027\" data-end=\"1041\"\u003eEJ20 engines\u003c\/li\u003e\n\u003cli data-section-id=\"5k46xp\" data-start=\"1042\" data-end=\"1056\"\u003eEJ25 engines\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3 data-section-id=\"1vradcd\" data-start=\"1058\" data-end=\"1083\"\u003eVehicle Applications:\u003c\/h3\u003e\n\u003cul data-start=\"1084\" data-end=\"1189\"\u003e\n\u003cli data-section-id=\"iwg5qb\" data-start=\"1084\" data-end=\"1106\"\u003e2002–2014 Subaru WRX\u003c\/li\u003e\n\u003cli data-section-id=\"3gygsx\" data-start=\"1107\" data-end=\"1129\"\u003e2004–2020 Subaru STI\u003c\/li\u003e\n\u003cli data-section-id=\"6x5slz\" data-start=\"1130\" data-end=\"1160\"\u003e2004–2008 Subaru Forester XT\u003c\/li\u003e\n\u003cli data-section-id=\"15lmsmr\" data-start=\"1161\" data-end=\"1189\"\u003e2005–2009 Subaru Legacy GT\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2 data-section-id=\"6hv2og\" data-start=\"1191\" data-end=\"1210\"\u003ePackage Includes\u003c\/h2\u003e\n\u003cul data-start=\"1211\" data-end=\"1273\"\u003e\n\u003cli data-section-id=\"1g2p60s\" data-start=\"1211\" data-end=\"1239\"\u003e(1) Cylinder 4 Coolant Mod\u003c\/li\u003e\n\u003cli data-section-id=\"1muv1bi\" data-start=\"1240\" data-end=\"1255\"\u003e(1) T-Fitting\u003c\/li\u003e\n\u003cli data-section-id=\"1fugumi\" data-start=\"1256\" data-end=\"1273\"\u003e(2) Hose Clamps\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2 data-section-id=\"xe9fpi\" data-start=\"1275\" data-end=\"1283\"\u003eNotes\u003c\/h2\u003e\n\u003cul data-start=\"1284\" data-end=\"1429\"\u003e\n\u003cli data-section-id=\"vbs0vn\" data-start=\"1284\" data-end=\"1357\"\u003eInstallation recommended for experienced builders or professional shops\u003c\/li\u003e\n\u003cli data-section-id=\"viqnhz\" data-start=\"1358\" data-end=\"1429\"\u003eDesigned for performance and reliability-focused cooling improvements\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp data-start=\"1431\" data-end=\"1542\" data-is-last-node=\"\" data-is-only-node=\"\"\u003e\u003cstrong data-start=\"1431\" data-end=\"1542\" data-is-last-node=\"\"\u003eAll warranties, claims, and product-related issues must be handled directly through BULL BOOST PERFORMANCE.\u003c\/strong\u003e\u003c\/p\u003e","brand":"Racing Precision Motorsports","offers":[{"title":"Default Title","offer_id":45414764216380,"sku":"720053572377","price":29.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0632\/5934\/4956\/files\/ej20no_911x945_e3bfd13a-c480-4b71-b876-619002e311ec.webp?v=1778642288","url":"https:\/\/rpm-racing.com\/products\/bull-boost-performance-performance-cylinder-4-coolant-mod-for-subaru-wrx-sti-ej20-ej25-engines","provider":"Racing Precision Motorsports","version":"1.0","type":"link"}