{"product_id":"csf-audi-b5-s4-high-performance-radiator","title":"CSF Audi B5 S4 High-Performance Radiator","description":"\u003cp class=\"font-claude-response-body break-words whitespace-normal\" dir=\"ltr\"\u003eIntroduced back in 1997, the Audi B5 S4 came stock with a 2.7L twin-turbo V6 pushing out a baseline of 250hp and 258lb-ft of torque, and remains a genuine sleeper favourite among track enthusiasts. A simple tune and a few basic bolt-on parts can easily add on 100hp, making bigger turbos and other high-performance upgrades a popular path on this platform. But adding power also means adding heat, and until CSF developed this radiator, there hadn't been a reliable, drop-in fit option at an acceptable price point available on the market.\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\" dir=\"ltr\"\u003eThese cars are now 20-plus years old, and if you haven't already had to replace the original plastic tank radiator, the time is genuinely coming soon regardless of how the car is driven. CSF's answer is a 2-row, 42mm core in a triple-pass configuration, using CSF's exclusive B-Tube technology to increase heat transfer by approximately 15% over regular oval welded tubes. The triple-pass design allows coolant to flow through the core three times rather than just once, letting much colder ambient air exchange heat with the coolant for three times longer and generating the lowest achievable outlet temperature. Super-efficient multi-louvered fins maximise airflow through the core, and exceptionally cut aluminium brackets with CNC-machined fittings make for a genuinely precise fit. This is a true drop-in fit requiring no modifications to install, with OE-matching inlet\/outlet connections so you can reuse factory or aftermarket hoses.\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 points and hose connections. Manual transmission vehicles.\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 Radiator\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\"\u003eGenuine triple-pass flow structure, coolant crosses the core three times for the lowest outlet temperature\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\"\u003eCSF's exclusive B-Tube technology, approximately 15% more heat transfer than regular tubes\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\"\u003eAnswers a genuine gap in the market, no reliable drop-in aftermarket option previously existed at this price point\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\"\u003eCNC-machined brackets and fittings for a precise, durable fit\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\"\u003e100% all-aluminium, TIG-welded construction, a real upgrade over the ageing factory plastic tank design\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\"\u003eTrue drop-in fit, no modifications required, reuses OE or aftermarket hoses\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\"\u003eAudi S4 (B5, 1997-2002, 2.7L Twin-Turbo V6, manual transmission)\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\" dir=\"ltr\"\u003e\u003cstrong\u003eNote:\u003c\/strong\u003e confirm automatic transmission compatibility with your supplier before listing, as sourcing specifically references manual transmission fitment for this part.\u003c\/p\u003e","brand":"CSF","offers":[{"title":"Default Title","offer_id":54445108166989,"sku":"CSF-7071","price":739.0,"currency_code":"EUR","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0980\/4808\/2253\/files\/https_i6tuning.com_products_csf-audi-b5-s4-high-performance-radiator.webp?v=1785680546","url":"https:\/\/i6tuning.com\/products\/csf-audi-b5-s4-high-performance-radiator","provider":"i6 Tuning","version":"1.0","type":"link"}