CSF High-Performance all-aluminum radiator for the BMW E39 M5 (2000-2003) and 540i manual (1999-2003); it also fits the automatic transmission with a modified drain plug. It uses a dual-core 2-row 42mm core with CSF's exclusive B-Tube technology, which raises tube heat-transfer surface area by about 15% over standard O-shape tubes for stronger cooling on the street or at the track. Ultra-efficient multi-louvered fins with a 6.5mm fin height maximize airflow through the core. The radiator is a drop-in fit and accepts all factory components, including the quick-connect hoses, AC condenser, mounting brackets, and fan shroud.
| Type | High-performance all-aluminum radiator (CSF B-Tube) |
| Core | 2-row 42mm dual core, B-Tube technology |
| Fins | Multi-louvered, 6.5mm fin height |
| Inlet / Outlet | CNC-machined quick-connect connections |
| Finish | Smooth satin |
| Fit | Drop-in (manual); fits automatic with modified drain plug; accepts OEM hoses, AC condenser, brackets, and fan shroud |
| Included | All-aluminum race-style drain plug |
This part fits:
| Year | Make | Model | Submodel |
|---|---|---|---|
| 1999-2003 | BMW | 540i | Base |
