Description CSF 8355 High-Performance Auxiliary Radiator for BMW M2 (F87) CSF 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. 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. Some F3X 340i/440i and F2X M240i/M140i did not come equipped with two 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 - Bracket, aux. radiator, lower left 51-74-7-389-931 - Bracket, aux. radiator, lower right 51-74-7-389-932