CSF BMW B58 M240I/M340I/M440I/Supra High-Performance Auxiliary Radiator

CSF manufactures what is genuinely the most advanced and efficient radiator in the industry for your BMW or Supra, using innovative tube and fin technologies with industry-leading testing methods to maximise airflow and heat dissipation. As part of CSF's proven B58 Gen 2 cooling suite alongside their well-known heat exchanger and manifold products, this Auxiliary Radiator addresses the wider cooling system limitations that emerge under increased power and sustained aggressive driving on this platform.

The 2-row, 42mm ultra-high-performance core uses CSF's exclusive B-Tube technology, paired with 6.5mm tall multi-louvered fins for maximum surface area contact and heat dissipation. CNC-machined mounting brackets and OEM-style quick-connect inlet/outlet fittings ensure a precise, durable fit, and 100% all-aluminium, TIG-welded construction offers a genuine upgrade over the factory design. This radiator is designed to fit both left and right sides, a practical detail for stocking and spares.

Works with: OEM mounting location and quick-connect fittings. Fits both left and right sides, sold individually.

Why Choose This Auxiliary Radiator

• 2-row, 42mm ultra-high-performance core with CSF's exclusive B-Tube technology
• 6.5mm tall multi-louvered fins for maximised surface area contact and heat dissipation
• Same design fits both left and right sides, genuinely simplifies stocking and spares
• CNC-machined mounting brackets and OEM-style quick-connect fittings
• 100% all-aluminium, TIG-welded construction for genuine long-term durability
• Complements CSF's proven B58 Gen 2 heat exchanger and manifold products for a complete cooling overhaul

Compatibility

• BMW G20/G21 M340i (B58 Gen 2)
• BMW G22/G23/G26 M440i (B58 Gen 2)
• BMW G42 M240i (B58 Gen 2)
• BMW G29 Z4 M40i (B58 Gen 2)
• Toyota GR Supra A90/A91 (B58 Gen 2)

Sold individually. Fits both left and right sides, most applications require both for a complete upgrade.