The S55 uses a top mounted water-to-air intercooler served by two parallel radiators, and the larger of the two sits at the front of the centre cooling module. do88 rebuilt it around a 3D scan of the available space, extending core height by 166mm and thickness by 5mm to reach 8498 cm3 of core volume against 4843 cm3 stock, a 75 percent gain, with frontal area up 48 percent to 2656 cm2. The single row core is 32mm thick with multi-channel tubes, 7mm multi-louvered fins and the OE dual pass flow layout, so it drops into the factory cooling lines. Run together with do88's side mount radiator, their testing measured a 5 degree C lower post intercooler air temperature at 240 km/h.
Specifications
| Type | Front mount charge-air cooling radiator (heat exchanger) |
| Position | Front, centre cooling module |
| Core | 1 row, 32mm thick, multi-channel tubes, 7mm multi-louvered fin, dual pass |
| Core Volume | 8498 cm³ (OE 4843 cm³, 75% larger) |
| Frontal Area | 2656 cm² (OE 1794 cm², 48% larger) |
| Material | Aluminium |
| Included | Radiator, 2 silicone caps 21mm, zip tie |
| Part Number | WC-350 |
| OEM Replacement | 17112284608 |
| Quantity | 1 |
Documents: Installation Instructions (PDF)
This part fits:
| Year | Make | Model | Submodel |
|---|---|---|---|
| 2019 | BMW | M2 | Competition |
| 2020 | BMW | M2 | Competition |
| 2015 | BMW | M3 | Base |
| 2016 | BMW | M3 | Base |
| 2017 | BMW | M3 | Base |
| 2018 | BMW | M3 | Base |
| 2015 | BMW | M3 | Competition |
| 2016 | BMW | M3 | Competition |
| 2017 | BMW | M3 | Competition |
| 2018 | BMW | M3 | Competition |
| 2015 | BMW | M4 | Base |
| 2016 | BMW | M4 | Base |
| 2017 | BMW | M4 | Base |
| 2018 | BMW | M4 | Base |
| 2019 | BMW | M4 | Base |
| 2020 | BMW | M4 | Base |
| 2015 | BMW | M4 | Competition |
| 2016 | BMW | M4 | Competition |
| 2017 | BMW | M4 | Competition |
| 2018 | BMW | M4 | Competition |
| 2019 | BMW | M4 | Competition |
| 2020 | BMW | M4 | Competition |
| 2016 | BMW | M4 | GTS |
| 2018 | BMW | M4 | CS |
| 2019 | BMW | M4 | CS |
Shipping
- In-stock orders placed before 3 PM EST ship the same day — everything else ships within 24 hours.
- Standard, expedited, and overnight options at checkout.
- Oversized items ship by freight and take longer.
- Backordered items ship as soon as stock lands — contact us for lead times.
- International orders: prices do not include VAT, duties, or import fees. Your country charges these at import and they are the buyer’s responsibility.
Returns
- 30-day returns on new, uninstalled items in original packaging with all hardware.
- Standard returns: 8% restocking fee, buyer pays return shipping. Both waived if the item is defective or we made the error.
- Installed or used parts can’t be returned — confirm fitment before you install.
- Special orders and custom items are final sale.
- Email us for return authorization before shipping anything back.
Full details: Shipping Policy · Refund Policy
