WARNING: This product can expose you to chemicals that are known to the State of California to cause cancer, birth defects or other reproductive harm. For more information, visit www.P65warnings.ca.gov.Pushing your N55-powered BMW on track or on the street? The factory auxiliary radiators on the F87 M2, F3X 340i/440i, and F2X M240i start to show their limits once you add power and lean on the cooling system. Heat soak cuts sessions short and keeps intake temps high on pulls. The CSF 8355 is the high-performance aux radiator upgrade engineered to solve it.
Each unit is a true drop-in fit into the factory location using OEM quick-connect hoses. CSF's exclusive B-Tube core technology increases heat transfer surface area compared to conventional tubes, and the multi-louvered fin design pulls more heat out per pass of airflow. Tank volume and core size are both increased over OEM. The result is lower, more stable coolant temperatures during spirited driving and a higher heat soak threshold so you can run longer before backing off.
Key Features
- 2-Row 42mm core with CSF's exclusive B-Tube technology
- 5mm multi-louvered fins for maximum surface area contact
- Increased tank volume and core size over OEM
- 100% all-aluminum TIG-welded construction
- OEM-style quick-connect inlet/outlet. No modifications needed.
- Mounts in the factory location using OE hardware
- Multi-fit design, works on both left and right sides
- Detachable rock guard included
- Satin black finish for OEM-plus look
- Individually leak and pressure tested
- 2-year limited warranty
Specifications
| Core Material | Aluminum |
| Tank Material | Aluminum |
| Core Configuration | 2-Row, 42mm thick, Down Flow |
| Inlet / Outlet Diameter | 16.3mm, Slip-On OE type |
| Inlet Location | Top Center |
| Outlet Location | Bottom Center |
| Finish | Satin Black |
| Frame Included | Yes |
| Mounting | Uses factory OE hardware |
| Grade | Performance |
Fits
BMW F87 M2 (N55 engine, 2016-2018)
BMW F30 / F31 / F32 / F33 / F34 / F36 340i and 440i (2016-2019)
BMW F22 / F23 M240i (2017-2021)
Note: Each unit is sold individually. Most F87 M2 and N55 applications use two auxiliary radiators (left and right). Order quantity accordingly.
Installation
Designed as a true drop-in fit. Installs in the OEM location using factory mounting hardware and OEM quick-connect hoses. No modifications, no custom brackets. Expect 1 to 2 hours per side for an experienced DIY installer. CSF recommends a qualified shop if you have not done aux radiator work before.
Warranty: 2-year limited warranty.
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