The do88 performance radiator is a direct drop-in upgrade for manual transmission N54 and N55 powered BMWs, engineered to hold coolant temperatures in check during sustained hard driving. Its all-aluminum core uses uninterrupted welds in a single-tube 40mm design with 5.0mm multi-louvered fins, giving a 29% larger core volume than the OE unit (8616cm³ versus 6701cm³). The larger frontal area and thicker core shed more heat while bolting into the factory location with no modifications. It replaces OE part 17117558480.
| Type | Performance aluminum radiator (do88) |
| Material | Aluminum, single-tube 40mm core |
| Transmission | Manual |
| Part Number | WC-390 |
| OEM Replacement | 17117558480 |
This part fits:
| Year | Make | Model | Submodel |
|---|---|---|---|
| 2007-2013 | BMW | 135i | N54/N55 Manual (E82/E88) |
| 2007-2013 | BMW | 335i | N54/N55 Manual (E90/E92/E93) |
| 2009-2016 | BMW | Z4 sDrive35i | N54 Manual (E89) |
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