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CSF heat exchanger for BMW B58 — G2x / G4x / Z4
CSF

CSF High-Performance Heat Exchanger — B58 (G2x / G4x / Z4)

$1,105.00

CSF front-mount heat exchanger for the Gen-2 B58 — the radiator side of the water-to-air charge-cooling system. On these cars the intake charge is cooled by a coolant loop, and this front exchanger is what pulls heat back out of that coolant. The factory unit is a single-row, ~25mm core; once boost goes up it can't shed heat fast enough and intake temps climb pull after pull.

What CSF changes

A 2-row, 42mm core using CSF's B-Tube internal geometry — far more cooling capacity than the OEM single-row piece. All-aluminum and TIG-welded, with an included rock guard and OEM transmission-cooler mounting points built in. Drop-in fit using the factory locations and quick-connect lines.

Finishes

We spec these with a Thermal Heat Dispersion coating by default — an emissivity coating that helps the core radiate heat away, which is exactly what you want on a cooler. Prefer to skip it? Raw or Black are available for less. Choose above.

Fitment

Gen-2 B58 — G20/G21 330i & M340i, G22/G23/G26 430i & M440i, G42 M240i, and G29 Z4. Confirm your chassis in the selector.

This is the heat-exchanger-side core of a B58 Stage 2 build. The Stage 2 Kit — B58 packages the matched parts + calibration for 8% under à la carte.

Fits engine B58
Fits chassis G20 · G21 · G29 · G42 · G05 · G06 · G07
Category Cooling
Manufacturer CSF

Ships from Boca Raton, FL.

WHY WE SHIP CSF
CSF builds the radiators, heat exchangers, and charge coolers we use when the factory cooling stack can no longer keep up with the load a tuned car puts on it. The cores are engineered to factory fitment, so the upgrade goes in at the OEM locations without fabrication. On the heat-exchanger-cooled engines, the charge cooler is often the single highest-leverage cooling part, and CSF's units carry the thermal capacity to keep intake temps stable through repeated pulls. We ship CSF where a build needs more cooling than stock without giving up clean, factory-style integration.