CSF Triple Pass (3‑Pass) Aluminium Performance Radiator for BMW M3 E9X (E90/E92/E93, S65 4.0 V8) – Dual-Row 42mm B‑Tube Core, Alloy Racing/Track Day Uprated Cooling, Direct-Fit Plug & Play Replacement Heat Exchanger

CSF Three-Pass Alloy Radiator for BMW M3 E90 E92 E93 - High Capacity Cooling for S65 4.0 V8

Beat heat soak and keep coolant temps in check with this CSF motorsport-grade alloy heat exchanger. Purpose-built for the BMW M3 E9x platform, this uprated radiator is the go-to solution for track days, fast road use and hard-driven S65 builds that demand reliable thermal control. If you are chasing consistent performance in hot weather or on long stints, this is the cooling system upgrade that delivers.

What makes it a serious upgrade

• Three-pass flow path for maximum temperature drop across the core
• Two-row 42 mm B-tube core with high-efficiency, multi‑louvred fins for rapid heat transfer
• Plug-and-play fit with OEM quick-connect hose fittings and factory mounts
• All-aluminium construction with CNC-machined connections for durability and leak-free reliability
• Hand-polished finish for a premium engine bay look
• Wind tunnel tested with around 20 percent greater heat rejection than the factory unit
• Lightweight at only 12 lbs yet heavy-duty in performance

Built for hard use, on road and circuit

Whether you are tackling a summer track day, fast B-road runs or sitting in traffic after a spirited blast, this CSF radiator stabilises coolant temperature for the S65 V8, helping prevent power fade and protecting your engine. It accepts the standard fan shroud, AC condenser and mounting points, so installation is straightforward and clean.

Technical highlights

• Dual-row 42 mm matrix using CSF B-tube technology for increased surface area
• 6.5 mm fin height, high-density louvred fin design for efficient airflow and heat exchange
• Three-pass internal routing for cooler outlet temps and improved thermal efficiency
• CNC-machined brackets, quick-connect inlet and outlet, and an all-aluminium drain plug
• Direct replacement that retains OEM hoses, shrouds and brackets

Compatibility

• BMW M3 E90 Saloon 2006-2013
• BMW M3 E92 Coupe 2006-2013
• BMW M3 E93 Convertible 2006-2013
• Engine: S65 V8

Tried and trusted by our team and customers

We have fitted and used this CSF three-pass radiator on our own cars and customer builds. Feedback is consistently positive, citing OE-style fitment, impressive temperature control and confidence on long sessions. It is a proven solution for anyone seeking an uprated BMW M3 cooling package without compromising daily drivability.

Installation and support

This is a direct replacement for the stock unit and integrates with standard ancillaries for a clean install. Prefer professional fitting. Book your installation with MJ Modifications in Warwickshire. Request a quote at info@mjmodifications.co.uk.

Search terms our customers use

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