CSF Triple Pass Radiator — BMW M3 (E46)

All-aluminum triple-pass radiator for the S54-powered E46 M3. The triple-pass design routes coolant across the core three times before it exits, substantially increasing heat rejection over the factory unit.

Why It Matters

The E46 M3's factory radiator uses plastic end tanks that crack with age and heat cycling — a well-known failure point on this chassis, and one that gets worse with track use.

Direct fit, no modification required.