CSF Front Mount Performance Heat Exchanger (FMHE) - Race Version for BMW F8X M3/M4 (F80 F82 F83) S55 | Charge Cooler / Intercooler Radiator Upgrade | Dual-Pass 42mm B-Tube Core

Race‑spec Low Temperature Radiator Upgrade for BMW F80 M3, F82 M4, F83 M4

Beat heat soak and keep charge temps stable with the CSF race version low temp radiator for the S55’s water‑to‑air chargecooler system. This front‑mounted auxiliary radiator is engineered for fast road, time attack and track day use, delivering consistent intake temperature control on both stock and mapped cars. If you want stronger back‑to‑back performance, quicker recovery between pulls and dependable cooling on tuned F8X platforms, this is the go‑to solution.

We have fitted and run this unit on our own F8X builds at MJ Modifications, and customer feedback has been outstanding. Fit and finish are first class, performance is repeatable, and the quality of the CSF construction is clear the moment you see it.

Why this upgrade works

• High efficiency 2‑row 42 mm core with CSF B‑tube technology for excellent heat rejection and strength
• Dual‑pass flow route so coolant crosses the core twice for lower outlet temps and improved IAT control
• Tight fin pack with multi‑louvered design to maximise surface area and airflow through the grille
• CNC‑machined quick‑connect inlet and outlet for a secure, leak‑free interface to factory hoses
• OEM‑style brackets and fittings for precise, direct fitment
• Removable aluminium stone guard to protect the core on road and circuit
• All‑aluminium race drain plug
• Hand‑polished finish for a premium look behind the front bumper
• Accepts OEM quick‑release hoses, retains the factory X‑brace, ducts and shrouds
• 50‑row, limited availability race design
• Covered by CSF’s lifetime warranty

Real‑world benefits

• Reduced heat soak on hard road use and during long stints
• More consistent power delivery on repeated pulls and laps
• Ideal foundation for Stage 1 and Stage 2 tuning packages
• Confidence for hot weather, track days and heavy traffic

Compatibility

Designed for BMW F8X S55 models:

• F80 M3
• F82 M4
• F83 M4 Convertible

Note: Minor trimming is required to the underside of the upper core support. Once trimmed, it uses the factory quick‑connect hoses and keeps the OEM X‑brace and ducting.

What’s in the box

• CSF race version low temp radiator for the S55 chargecooler circuit
• Removable aluminium rock guard
• CNC‑machined OEM‑style brackets and fittings
• All‑aluminium drain plug

Installation

Professional fitting recommended. We can install in‑house at MJ Modifications, Warwickshire. Request a quote: info@mjmodifications.co.uk.

Trusted by enthusiasts

Used by us and loved by our customers, this CSF race radiator is a proven S55 cooling upgrade that delivers reliable temperature control and repeatable performance on the F8X platform.

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