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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 340i/440i, and F2X M240i/M140i.

The new CSF Auxiliary Radiators are a great addition to the popular F87 (N55) & F3X/F2X 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.

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FEATURES

• Sold Individually - most applications use 2 auxiliary radiators
• Multi-Fit - Fits Both Left & Right Side
• 2-Row - 42mm High-Performance Core Featuring CSF's Exclusive B-tube Technology
• New 5mm Tall Ultra Efficient Fins with a Multi-Louvered Design for Maximum Surface Area Contact
• Tank Volume and Core Size Increased
• 100% All-Aluminum TIG-Welded Construction
• OEM Style "Quick Connect" Inlet/Outlet
• True "Drop-in Fit" Requires No Modifications to Install
• Includes Detachable Rock Guard
• Individually Leak and Pressure Tested
• High-Performance Upgrade Suitable for Professional Racing, Street Performance, or OEM Replacement
• Satin Black Finish for OEM+ Look
• 2 Year Limited Warranty

APPLICATIONS

⚠ Fitment Notes

F3X 340i/440i and F2X M240i

Some F3X 340i/440i and F2X M240i/M140i 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 340i/440i and M240i/M140i. 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

F87 M2 (N55)

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 Numbers

• BMW: 17-11-8-625-447
• BMW: 17 11 8 625 447
• BMW: 17118625447
• BMW: 17-21-8-625-445
• BMW: 17 21 8 625 445
• BMW: 17218625445

Warranty

Cooling Systems and Flexibles, Inc. (CSF) warrants CSF’s 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 CFS Page.

SKU# 8355 Warranty Term: 2 years