{"id":17830,"date":"2025-05-28T11:16:17","date_gmt":"2025-05-28T08:16:17","guid":{"rendered":"https:\/\/www.mwsteel.eu\/?post_type=product&#038;p=17830"},"modified":"2026-09-18T13:52:24","modified_gmt":"2026-09-18T10:52:24","slug":"hks-spark-plugs-m40-hl-m45-hl-m50-hl","status":"publish","type":"product","link":"https:\/\/www.mwsteel.eu\/en\/product\/hks-spark-plugs-m40-hl-m45-hl-m50-hl\/","title":{"rendered":"HKS Spark Plugs M40-HL, M45-HL, M50-HL"},"content":{"rendered":"<p>We have the full selection of HKS Super Fire Racing spark plugs for race and tuning applications, featuring reinforced ignition capabilities, durability and anti-insulation.<\/p>\n<p>The thermal edge of the ceramic insulator discharges to help decrease carbon deposits under long idling.<\/p>\n<p>Their iridium alloy center electrode reduces voltage requirements and improves ignition performance and durability.<\/p>\n<p>The heat ranges are designed to withstand high temperatures and pressures under racing conditions.<\/p>\n<p>Notable applications include:<\/p>\n<p>Toyota 86 \/ Subaru BRZ \/ Scion FR-S (FA20 and FA24 engines): These are very common applications for the M45HL and M50HL, especially for tuned setups.<\/p>\n<p>Nissan GT-R R35 (VR38DETT engine): The M50HL is a highly recommended upgrade for high-horsepower R35 GT-Rs.<\/p>\n<p>Certain Honda (e.g., L15B1, LFA) and Infiniti (e.g., VQ35HR, VQ37VHR) engines that utilize these specific dimensions.<\/p>\n<p>The chart below illustrates the respective Denso and NGK heat range indexes.<\/p>\n<p><img decoding=\"async\" class=\"alignnone wp-image-17801\" src=\"https:\/\/www.mwsteel.eu\/wp-content\/uploads\/2025\/05\/HKS-lampoarvotaulukko-325x57.jpg\" alt=\"\" width=\"518\" height=\"91\" srcset=\"https:\/\/www.mwsteel.eu\/wp-content\/uploads\/2025\/05\/HKS-lampoarvotaulukko-325x57.jpg 325w, https:\/\/www.mwsteel.eu\/wp-content\/uploads\/2025\/05\/HKS-lampoarvotaulukko-600x104.jpg 600w, https:\/\/www.mwsteel.eu\/wp-content\/uploads\/2025\/05\/HKS-lampoarvotaulukko.jpg 707w\" sizes=\"(max-width: 518px) 100vw, 518px\" \/><\/p>\n<p>Choose the best option from the drop down menu.<\/p>\n","protected":false},"excerpt":{"rendered":"<h4>Technical specifications<\/h4>\n<ul>\n<li>The M-HL series plugs are known for their fitment in vehicles with tight spark plug well access and specific M12 x 26.5 Long Reach thread with a narrow plug wrench size 14 mm \/ 0.55&quot;<\/li>\n<li><strong>Three heat ranges are available:<\/strong> 40 (NGK 8), 45 (NGK 9) and 50 (NGK 10).<\/li>\n<\/ul>\n","protected":false},"featured_media":17804,"comment_status":"closed","ping_status":"closed","template":"","meta":[],"product_brand":[],"product_cat":[1046],"product_tag":[],"class_list":["post-17830","product","type-product","status-publish","has-post-thumbnail","product_cat-spark-plugs","pa_tuotteet-hks-en","first","instock","taxable","shipping-taxable","purchasable","product-type-variable"],"_links":{"self":[{"href":"https:\/\/www.mwsteel.eu\/en\/wp-json\/wp\/v2\/product\/17830","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.mwsteel.eu\/en\/wp-json\/wp\/v2\/product"}],"about":[{"href":"https:\/\/www.mwsteel.eu\/en\/wp-json\/wp\/v2\/types\/product"}],"replies":[{"embeddable":true,"href":"https:\/\/www.mwsteel.eu\/en\/wp-json\/wp\/v2\/comments?post=17830"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.mwsteel.eu\/en\/wp-json\/wp\/v2\/media\/17804"}],"wp:attachment":[{"href":"https:\/\/www.mwsteel.eu\/en\/wp-json\/wp\/v2\/media?parent=17830"}],"wp:term":[{"taxonomy":"product_brand","embeddable":true,"href":"https:\/\/www.mwsteel.eu\/en\/wp-json\/wp\/v2\/product_brand?post=17830"},{"taxonomy":"product_cat","embeddable":true,"href":"https:\/\/www.mwsteel.eu\/en\/wp-json\/wp\/v2\/product_cat?post=17830"},{"taxonomy":"product_tag","embeddable":true,"href":"https:\/\/www.mwsteel.eu\/en\/wp-json\/wp\/v2\/product_tag?post=17830"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}