{"product_id":"csf-aluminum-performance-radiator-2011-1m-coupe-e81-135i-auto","title":"CSF Aluminium Performance Radiator (B-Tube) - BMW 1 Series 135i E82\/E88 2008-2013, 1M Coupe 2011, 335i E90\/E92 Auto - Direct-Fit Drop-In Upgrade (N54\/N55)","description":"\u003cp\u003e\u003cstrong\u003eCSF Aluminium Performance Radiator for BMW 1 Series 135i and 1M, plus E90\/E92 335i Automatic\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cp\u003eUnlock proven cooling performance and reliability with the CSF Aluminium Performance Radiator. This direct-fit, drop-in upgrade is engineered for BMW 1 Series 135i and 1M, and E90\/E92 335i automatic transmission models. Built with CSF’s renowned B-Tube core and robust aluminium end tanks, it delivers significantly improved heat dissipation, strength and durability compared to the factory plastic-tank radiator.\u003c\/p\u003e\n\n\u003cul\u003e\n  \u003cli\u003eDrop-in fitment to E82 135i and 1M, plus E90\/E92 335i automatic transmission models\u003c\/li\u003e\n  \u003cli\u003eHigh performance aluminium core with CSF B-Tube design\u003c\/li\u003e\n  \u003cli\u003eAluminium end tanks replace weak plastic tanks to prevent cracking and leaks\u003c\/li\u003e\n  \u003cli\u003eDesigned and tested in the USA, with extensive validation at CSF production facilities\u003c\/li\u003e\n  \u003cli\u003eUses all factory shrouding, hose connections and mounting points\u003c\/li\u003e\n  \u003cli\u003eIndividually leak-tested and 30-point inspected before shipping\u003c\/li\u003e\n  \u003cli\u003eTwo year CSF warranty\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003e\u003cstrong\u003eWhy upgrade to the CSF B-Tube aluminium radiator\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eCSF’s advanced B-Tube technology features two internal coolant tubes shaped like a B. This increases surface area for better heat transfer, improves rigidity for higher burst strength and allows for thinner, lighter material that is more efficient. Combined with a thicker core, this radiator offers excellent cooling headroom without unnecessary weight. By eliminating plastic end tanks and connections, it removes the common failure point of the OE radiator, especially on cars that see high temperatures and sustained use.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eQuality and testing you can trust\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eCSF radiators are designed and developed in the USA, then validated with wind tunnel, vibration, thermal cycle, burst pressure and salt spray testing in Southeast Asia. Every unit is leak-tested and receives a thorough inspection for consistent, OE-level fit and finish. CSF is an OE supplier and private-label manufacturer for leading brands, so you get top-tier quality in a true bolt-in package.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eFitment\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eBMW 1 Series\u003c\/li\u003e\n  \u003cli\u003eE82 \/ E88 (08-13) 135i\u003c\/li\u003e\n  \u003cli\u003eE82 \/ E88 (08-13) 135is\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eAlso suits BMW 1M Coupe (2011) and E90\/E92 335i automatic transmission models as a drop-in upgrade, using all factory hardware.\u003c\/p\u003e\n\u003cp\u003e\u003cem\u003eNote:\u003c\/em\u003e The thicker core tightens tolerances, particularly between the expansion tank and accessory belt. This is not a fitment issue, but care is advised during installation.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eInstallation and support\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eWe recommend professional fitting. Nforcd offers installation at our Warwickshire facility. For a fitting quote or to check compatibility for your specific BMW 135i, 1M or 335i automatic, email Sales@nforcd.com.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eWhat our customers say\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eWe have installed this CSF aluminium radiator on customer cars and the feedback has been excellent. Owners report more stable coolant temperatures and confidence in demanding conditions, with the added peace of mind that comes from ditching the brittle plastic end tanks.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eIdeal for road and track\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eWhether you are refreshing cooling on a daily-driven BMW 135i, preparing a 1M for spirited driving or upgrading a 335i automatic that sees heavy use, this CSF radiator is a smart, reliable, performance-focused upgrade that keeps temps in check and maximises longevity.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eSEO-friendly keywords to help you find the right part:\u003c\/strong\u003e BMW 135i radiator upgrade, BMW 1M radiator, E82 radiator, E88 radiator, BMW 335i automatic radiator, E90 radiator, E92 radiator, CSF radiator UK, CSF aluminium radiator, BMW N54 radiator, BMW N55 radiator, performance radiator 135i, 1 Series radiator upgrade, direct fit radiator, drop-in radiator, aluminium end tank radiator, BMW cooling upgrade, track day cooling, bolt-in radiator.\u003c\/p\u003e","brand":"Performance M","offers":[{"title":"Default Title","offer_id":42447477539004,"sku":"CSF7046","price":744.0,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0552\/9465\/6700\/products\/1445883389-csf-radiator__15332.1532359325_c5d3b434-a161-43ce-9b59-7feb3f5a1881.jpg?v=1706097011","url":"https:\/\/www.nforcd.com\/products\/csf-aluminum-performance-radiator-2011-1m-coupe-e81-135i-auto","provider":"Nforcd","version":"1.0","type":"link"}