M2/M3/M4 G8X High Performance Auxiliary Radiator

The CSF auxiliary radiator is a drop-in, OEM-location upgrade for the G8X cooling system, replacing the factory-style unit with all-aluminum TIG-welded construction, increased tank volume, and a higher-capacity core for improved heat rejection and recovery under hard street or track use.

Fitment

• BMW G8X: G87 M2 / G80 M3 / G82–G83 M4

• Sold individually, G8X applications use two auxiliary radiators

• Multi-fit: fits left or right side

Cooling System Specs

• Core design: 2-row auxiliary radiator

• Core thickness: 42mm

• Core width: 282mm

• Core height: 190mm

• Core material: aluminum

• Tank material: aluminum

• Flow type: down-flow

• CSF tech: B-Tube core + 5mm multi-louvered fin design for increased surface area and heat transfer

Connections & Placement

• Inlet connector type: slip-on

• Outlet connector type: slip-on

• Inlet location: top right

• Outlet location: bottom right

• Inlet diameter: 16.3mm

• Outlet diameter: 16.3mm

• OEM-style quick-connect inlet/outlet

• Mounts with OE hardware (mounting hardware not included)

Key Features

• 100% TIG-welded aluminum construction (replaces OE plastic tank design)

• Larger tank volume + larger core size vs OEM

• Detachable rock guard included

• Individually leak and pressure tested

• Satin black finish for OEM+ appearance

• True drop-in fit — no modifications required