This CSF auxiliary radiator upgrades the side-mounted coolers on the BMW F87 M2 and Gen 1 B58 cars (340i, 430i, 440i, M240i). Its 2-row 42mm core uses CSF's exclusive B-Tube technology with new 5mm ultra-efficient multi-louvered fins for increased tank volume and cooling capacity over the OE unit. The 100% TIG-welded all-aluminum build replaces the fragile OE plastic pod mounting with a stronger integrated frame, adds a detachable rock guard to protect against road debris, and drops in with no modifications. Sold individually; most applications use two.
| Type | High-performance auxiliary radiator |
| Material | 100% aluminum, TIG-welded |
| Core | 2-row 42mm, CSF B-Tube technology |
| Fins | 5mm multi-louvered |
| Inlet / Outlet | OEM-style quick-connect |
| Finish | Satin black |
| Fit | Drop-in; fits both left and right side; sold individually (most applications use two) |
| Included | Detachable rock guard |
| Part Number | 8355 |
| Warranty | 2-year limited warranty |
This part fits:
| Year | Make | Model | Submodel |
|---|---|---|---|
| 2016-2018 | BMW | 340i | Base |
| 2017-2019 | BMW | 340i GT xDrive | Base |
| 2016-2018 | BMW | 340i xDrive | Base |
| 2017-2020 | BMW | 430i | Base |
| 2017-2020 | BMW | 430i Gran Coupe | Base |
| 2017-2020 | BMW | 430i xDrive | Base |
| 2017-2020 | BMW | 430i xDrive Gran Coupe | Base |
| 2017-2020 | BMW | 440i | Base |
| 2017-2020 | BMW | 440i Gran Coupe | Base |
| 2017-2020 | BMW | 440i xDrive | Base |
| 2017-2020 | BMW | 440i xDrive Gran Coupe | Base |
| 2016-2018 | BMW | M2 | Base |
| 2017-2021 | BMW | M240i | Base |
| 2017-2021 | BMW | M240i xDrive | Base |
Shipping: In-stock orders placed before 3 PM EST ship the same day, and everything else ships within 24 hours. Standard, expedited, and overnight options are available at checkout. Backordered items ship as soon as we get them back in stock. Contact us for lead times. See the full Shipping Policy.
Returns: 30-day returns on new, unused items in original packaging. See the full Refund Policy.
