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CSF
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SKU:8355
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An industry-leading reputation and overwhelming success with BMW cooling has made CSF the #1 cooling choice for the F87 M2 (N55), F3X 340i440i, and F2X M240iM140i.
The new CSF Auxiliary Radiators are a great addition to the popular F87 (N55) & F3XF2X Cooling Suites. Like the other cooling systems on these BMWs, the aux rads do a pretty good job in stock form. However, once you start adding a lot of power and pushing the car in aggressive driving conditions, the factory systems start to show its limitations. As more and more owners keep pushing the limits of their M2s and Gen 1 B58s, CSF is here to keep them cool.
Product DetailsCSF designed the coolers to be a true "Drop-in Fit" for easy installation fitting both left and right sides. Each cooler mounts in the factory location and uses the OEM quick connections. The High-Performance Auxiliary Radiators work in conjunction with the rest of the cooling system to reduce temperatures. They not only help keep temperatures in optimal ranges, but prolong the heat soak threshold. There's nothing worse than having your track session cut short because you need to do a cooldown lap.
Compared to the OEM coolers, the CSF units are a significant upgrade. The TIG welded aluminum tanks are much larger than the OE plastic tanks offering superior strength and fluid volume. A larger 2-row 42mm core increases cooling efficiency and capacity. This high efficiency core uses CSF's Exclusive B-Tube Technology and latest 5mm fin technology, maximizing airflow and heat dissipation. These 5mm fins significantly increase the heat exchange surface area improving overall cooling efficiency and recovery while still maintaining good airflow.
| Feature | CSF | OEM |
|---|---|---|
| Core Thickness | 42mm | 27.5mm |
| Core Rows | 2-Row | 1-Row |
| Fin Height | 5mm | 5mm |
| Tank Material | All-Aluminum | Plastic |
| Construction | 100% TIG-Welded | Crimp on Gasket |
With many motorsports teams and race enthusiasts now pushing over 700 horsepower, the B58 is seeing coolant temperatures well above normal. Once temperatures pass a safe limit the B58 will go into limp mode. Needless to say this can ruin a race, track session, or your overall driving fun in general. CSF is here to keep your B58 running at peak performance.
100% All-Aluminum construction ensures the best performance and durability. The integrated mounting frame is much stronger and more durable than the OE plastic pod mounting system. In addition, the black finish provides extra protection and corrosion resistance.
CSF auxiliary radiators offer even more durability with the integrated bolt on rock guards to keep the coolers safe. You've no doubt heard horror stories about OEM coolers getting punctured and spilling fluids all over the road or track. Now you can feel more confident that your cooling system is safer from road debris.
The F87 M2 Competition uses the same cooling system as the F8X M3 and M4, the N55 version has a completely different setup. The diagram below shows how the system is laid out.
The Auxiliary Radiator completes the F87 M2 Cooling Suite offered by CSF.
| Diagram # | BMW OE Part Number | CSF Part Number |
|---|---|---|
| 1 | BMW 17-51-7-600-531 Front Mount Intercooler |
CSF #81158115B High-Performance Step-Core Intercooler |
| 2 | BMW 17-21-2-409-076 Transmission Oil Cooler |
CSF #8103 Race-Spec Dual-Pass DTC Transmission Cooler |
| 3 | BMW 17-21-7-618-360 Engine Oil Cooler (Right Hand Side) |
CSF #8104 Race-Spec Oil Cooler |
| 5 | BMW 17-11-8-625-447 Auxiliary Radiator (Left Hand Side) | CSF #8355 High Performance Auxiliary Radiator |
| 6 | BMW 17-11-8-672-103 Radiator |
CSF #7078 High Performance All-Aluminum Radiator |
The Gen 1 B58 cooling system is decently complex. Diagrams have been included to show the details of how the whole system flows.
The Auxiliary Radiator completes the Gen 1 B58 Cooling Suite offered by CSF.
| Diagram # | BMW OE Part Number | CSF Part Number |
|---|---|---|
| A | BMW 17-11-8-741-830 Front Mount Heat Exchanger - Charge Air Cooling System |
CSF #81318131B High-Performance Front Mount Heat Exchanger |
| B | BMW 17-11-8-482-623 Radiator - Engine Cooling System |
CSF #7089 High Performance Radiator |
| C | BMW 17-11-8-625-447 Auxiliary Radiator (LeftRight Side) - Engine Cooling System | CSF #8355 High Performance Auxiliary Radiator |
| D | BMW 11-61-8-603-913 Charge Air Cooler - Charge Air Cooling System |
CSF #83008300B8300C Charge-Air-Cooler Manifold |
Some F3X 340i440i and F2X M240iM140i trim levels did not come equipped with any Auxiliary Radiators. Be sure to check your VIN to see how many coolers your BMW came with before ordering.
There were three different Auxiliary Radiators available for the F3X 340i440i and M240iM140i. The CSF #8355 is made to be a drop-in fit replacement for the BMW 17-11-8-625-447. It can also replace the BMW 17-11-7-628-057 & 17-11-7-600-697 with the correct mounting bracket(s). Vehicles that did not come equipped with the BMW 17-11-8-625-447 from the factory may require minor trimming to the air ducting to fit correctly. Models equipped with the M Sport Package & M Sport Brakes should use the 17-11-8-625-447, however you should verify using your VIN with a dealership.
The Upper Brackets are the same for all 3 versions of the Auxiliary Radiators. The lower bracket part numbers are listed below. Please note, the frames (cradles) are not required as the CSF #8355 incorporates the frame (BMW 17-21-8-625-445) into the cooler design.
Lower Brackets for the 17-11-8-625-447
| Part Name | BMW Part Number | Qty. |
|---|---|---|
| Bracket, aux. radiator, lower left | 51-74-7-389-931 | 1 |
| Bracket, aux. radiator, lower right | 51-74-7-389-932 | 1 |
Does NOT fit the F87 M2 Competition which uses the S55 Auxiliary Radiators (CSF #8258). The F87 M2 with the N55 uses a Single CSF #8355 Auxiliary radiator mounted on the Left Hand Side. The Right Hand Side uses the CSF #8104 Race-Spec Engine Oil Cooler.
Features| Year Range | Make | Chassis Code | Model | Trim | Engine Trans Etc | Notes |
|---|---|---|---|---|---|---|
| 2016-2018 | BMW | F87 | M2 | - | Turbocharged 3.0L L6 | Only Requires 1 |
| 2016-2018 | BMW | F3X | 340i | - | Turbocharged 3.0L L6 | BMW 17-11-8-625-447 Only - See Fitment Notes |
| 2016-2018 | BMW | F3X | 340i xDrive | - | Turbocharged 3.0L L6 | BMW 17-11-8-625-447 Only - See Fitment Notes |
| 2017-2019 | BMW | F3X | 340i GT xDrive | - | Turbocharged 3.0L L6 | BMW 17-11-8-625-447 Only - See Fitment Notes |
| 2017-2020 | BMW | F3X | 440i | - | Turbocharged 3.0L L6 | BMW 17-11-8-625-447 Only - See Fitment Notes |
| 2017-2020 | BMW | F3X | 440i xDrive | - | Turbocharged 3.0L L6 | BMW 17-11-8-625-447 Only - See Fitment Notes |
| 2017-2020 | BMW | F3X | 440i Gran Coupe | - | Turbocharged 3.0L L6 | BMW 17-11-8-625-447 Only - See Fitment Notes |
| 2017-2020 | BMW | F3X | 440i xDrive Gran Coupe | - | Turbocharged 3.0L L6 | BMW 17-11-8-625-447 Only - See Fitment Notes |
| 2017-2020 | BMW | F3X | 430i | - | Turbocharged 2.0L L4 | BMW 17-11-8-625-447 Only - See Fitment Notes |
| 2017-2020 | BMW | F3X | 430i xDrive | - | Turbocharged 2.0L L4 | BMW 17-11-8-625-447 Only - See Fitment Notes |
| 2017-2020 | BMW | F3X | 430i Gran Coupe | - | Turbocharged 2.0L L4 | BMW 17-11-8-625-447 Only - See Fitment Notes |
| 2017-2020 | BMW | F3X | 430i xDrive Gran Coupe | - | Turbocharged 2.0L L4 | BMW 17-11-8-625-447 Only - See Fitment Notes |
| 2017-2021 | BMW | F2X | M240i | - | Turbocharged 3.0L L6 | BMW 17-11-8-625-447 Only - See Fitment Notes |
| 2017-2021 | BMW | F2X | M240i xDrive | - | Turbocharged 3.0L L6 | BMW 17-11-8-625-447 Only - See Fitment Notes |
Some F3X 340i440i and F2X M240iM140i trim levels did not come equipped with any Auxiliary Radiators. Be sure to check your VIN to see how many coolers your BMW came with before ordering.
There were three different Auxiliary Radiators available for the F3X 340i440i and M240iM140i. The CSF #8355 is made to be a drop-in fit replacement for the BMW 17-11-8-625-447. It can also replace the BMW 17-11-7-628-057 & 17-11-7-600-697 with the correct mounting bracket(s). Vehicles that did not come equipped with the BMW 17-11-8-625-447 from the factory may require minor trimming to the air ducting to fit correctly. Models equipped with the M Sport Package & M Sport Brakes should use the 17-11-8-625-447, however you should verify using your VIN with a dealership.
The Upper Brackets are the same for all 3 versions of the Auxiliary Radiators. The lower bracket part numbers are listed below. Please note, the frames (cradles) are not required as the CSF #8355 incorporates the frame (BMW 17-21-8-625-445) into the cooler design.
Lower Brackets for the 17-11-8-625-447
| Part Name | BMW Part Number | Qty. |
|---|---|---|
| Bracket, aux. radiator, lower left | 51-74-7-389-931 | 1 |
| Bracket, aux. radiator, lower right | 51-74-7-389-932 | 1 |
Does NOT fit the F87 M2 Competition which uses the S55 Auxiliary Radiators (CSF #8258). The F87 M2 with the N55 uses a Single CSF #8355 Auxiliary radiator mounted on the Left Hand Side. The Right Hand Side uses the CSF #8104 Race-Spec Engine Oil Cooler.
OEM Part NumbersCooling Systems and Flexibles, Inc. (CSF) warrants CSFs High-Performance Cooling Systems, under normal use and service, to the original purchaser of the vehicle in which the product was originally installed. For more information and details please visit our Warranty Page
SKU# 8355 Warranty Term 2 years
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