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)

CSF B‑Tube Alloy Radiator Upgrade for BMW E82/E88 135i, 1M Coupe and E90/E92 335i Auto

Take control of coolant temps and reliability with this CSF high‑efficiency alloy radiator. It is a plug‑and‑play replacement that reuses factory hoses, shrouds and mounts, delivering serious cooling gains for turbocharged straight‑six models without any cutting or custom work. Built around CSF’s advanced B‑Tube core with robust welded aluminium tanks, it is a proven solution for hard road use, tuned cars and track days.

• OEM‑style fit for E82 and E88 135i, 2011 1M Coupe and E90/E92 335i with automatic gearbox
• CSF B‑Tube core for increased surface area and superior thermal efficiency
• Welded alloy tanks replace fragile OE plastic components to resist cracking and leaks
• Reuses original hardware, fan cowlings and hose connections for a tidy installation
• Each unit pressure tested and inspected prior to dispatch
• Backed by a two year CSF warranty

Why choose CSF’s B‑Tube core

The B‑Tube design uses twin internal passages shaped like a B to maximise contact area and airflow through the fins. The result is stronger burst resistance and improved heat rejection compared to standard tubes, helping stabilise temperatures on spirited drives, during hot weather, in traffic and on circuit. You get extra cooling headroom without needless weight.

Built to last

CSF engineers and validates its radiators with wind tunnel, vibration, pressure burst and thermal cycle testing. Every cooler is leak‑checked and finished to an OE‑grade standard so you can bolt it in with confidence.

Fitment

• BMW 1 Series E82 and E88 135i 2008 to 2013
• BMW 1M Coupe 2011
• BMW 3 Series E90 and E92 335i automatic

Note: The thicker core tightens clearances, especially near the expansion tank and auxiliary belt. Take care during installation.

Installation

For a professional fit, book your car in with MJ Modifications in Warwickshire. Email info@mjmodifications.co.uk for a fitting quote or to confirm compatibility with your vehicle.

Tried and recommended

We have fitted this CSF alloy rad for customers and on our own builds. Feedback has been outstanding, with owners reporting steadier coolant temperatures, faster recovery between pulls and greater confidence on fast road and track.

Perfect for fast road and track day use

Whether your N54 twin‑turbo or N55 single‑turbo car is stock or remapped, this uprated heat exchanger is a smart reliability upgrade that helps prevent hot‑soak, keeps coolant under control and supports sustained performance.

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