{"product_id":"csf-bmw-b58-gen-1-m140i-m240i-340i-440i-triple-pass-front-mount-heat-exchanger","title":"CSF BMW B58 Gen 1 (M140I\/M240I\/340I\/440I) Triple Pass Front Mount Heat Exchanger","description":"\u003cp class=\"font-claude-response-body break-words whitespace-normal\" dir=\"ltr\"\u003eUnlike the S55, the B58's charge cooler is built directly into the plastic intake manifold housing - but it shares the same fundamental challenge: as boost increases, so does charge air temperature, and the factory water-to-air cooling system quickly starts to struggle. Data shows intake air temperatures climbing rapidly on the OEM heat exchanger through just one gear pull at wide-open throttle, robbing power and increasing the risk of knock as the ECU's safety protocols step in.\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\" dir=\"ltr\"\u003eCSF's Triple-Pass Heat Exchanger tackles this at the source. The factory unit is a single-row core just 27mm thick - CSF's design uses the industry-exclusive world's largest 2-row core at 68mm, built with their B-Tube technology and 6.5mm multi-louvered fins. The defining feature is a unique triple-pass flow design: water travels through the core three times before exiting and returning to the manifold charge cooler, delivering the lowest possible outlet temperature - a genuine advantage over the OEM design and even more expensive aftermarket alternatives, all of which use a single-pass structure. The result is roughly \u003cstrong\u003e3x the cooling capacity of the OEM unit\u003c\/strong\u003e. An included detachable rock guard protects the core, and OEM CNC-machined mounting pins and brackets ensure a true plug-and-play fit.\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\" dir=\"ltr\"\u003e\u003cstrong\u003eWorks with:\u003c\/strong\u003e OEM mounting location - direct plug-and-play installation, no modification required.\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\" dir=\"ltr\"\u003e \u003c\/p\u003e\n\u003ch2 dir=\"ltr\" class=\"text-text-100 mt-2 -mb-1 text-base font-bold\"\u003eWhy Choose This Heat Exchanger\u003c\/h2\u003e\n\u003cul dir=\"ltr\" class=\"[li_\u0026amp;]:mb-0 [li_\u0026amp;]:mt-1 [li_\u0026amp;]:gap-1 [\u0026amp;:not(:last-child)_ul]:pb-1 [\u0026amp;:not(:last-child)_ol]:pb-1 list-disc flex flex-col gap-1 pl-8 mb-3 print:block print:space-y-1\"\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\"\u003e\n\u003cstrong\u003eWorld's largest 2-row, 68mm core\u003c\/strong\u003e - versus the OEM's single-row, 27mm design\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\"\u003e\n\u003cstrong\u003eUnique triple-pass flow design\u003c\/strong\u003e - roughly 3x the cooling capacity of the factory unit\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\"\u003e\n\u003cstrong\u003e6.5mm multi-louvered fins with B-Tube technology\u003c\/strong\u003e - maximised surface area and heat rejection\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\"\u003e\n\u003cstrong\u003eIncludes detachable rock guard\u003c\/strong\u003e - protects the core in this exposed front-mount position\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\"\u003e\n\u003cstrong\u003eDirect plug-and-play fit\u003c\/strong\u003e - OEM CNC-machined mounting pins and brackets\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\"\u003e\n\u003cstrong\u003eOngoing refinement\u003c\/strong\u003e - updated to \"Version 2.0\" spec with improved inlet\/outlet design\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003ch2 dir=\"ltr\" class=\"text-text-100 mt-2 -mb-1 text-base font-bold\"\u003eCompatibility\u003c\/h2\u003e\n\u003cul dir=\"ltr\" class=\"[li_\u0026amp;]:mb-0 [li_\u0026amp;]:mt-1 [li_\u0026amp;]:gap-1 [\u0026amp;:not(:last-child)_ul]:pb-1 [\u0026amp;:not(:last-child)_ol]:pb-1 list-disc flex flex-col gap-1 pl-8 mb-3 print:block print:space-y-1\"\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\"\u003eBMW F20\/F21 M140i (B58 Gen 1)\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\"\u003eBMW F22\/F23 M240i (B58 Gen 1)\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\"\u003eBMW F30\/F31\/F34 340i (B58 Gen 1)\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\"\u003eBMW F32\/F33\/F36 440i (B58 Gen 1)\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"CSF","offers":[{"title":"Raw","offer_id":54427338899789,"sku":"CSF-8131","price":889.0,"currency_code":"EUR","in_stock":false},{"title":"Black","offer_id":54427338932557,"sku":"CSF-8131B","price":889.0,"currency_code":"EUR","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0980\/4808\/2253\/files\/csf-bmw-b58-gen-1-m140i-m240i-340i-440i-triple-pass-front-mount-heat-exchanger.webp?v=1785408971","url":"https:\/\/i6tuning.com\/products\/csf-bmw-b58-gen-1-m140i-m240i-340i-440i-triple-pass-front-mount-heat-exchanger","provider":"Inline6 Tuning","version":"1.0","type":"link"}