CSF High-Performance Auxiliary Radiator w/ Rock Guard - F8x M2 Competition & CS, M3 & M4

The Racing & High Performance Division of CSF Inc. strives to build and engineer the most advanced, efficient, and reliable cooling systems in the world. CSF manufacturers a wide variety of sophisticated cooling systems with more than 117 different applications ranging from high performance all-aluminium direct-fit replacement radiators, to complete custom applications for race cars, power sports, off-road, marine, and industrial uses.

Product Information


The BMW F80 M3, F82/F83 M4 & F87 M2 Competiton are still regarded as some of the best performance platforms available. BMW’s S55 Motor has amazing potential for power and there are countless performance parts available for it. However, like most production engines, the S55 doesn’t come equipped from the factory with sufficient cooling capabilities to cope with added power or even prolonged performance driving. CSF have designed a full line of S55 cooling options to help you get the most out of your BMW F8X. The CSF Charge-Air-Cooler, Heat Exchanger, Transmission Cooler and now Auxiliary Radiators will keep you ahead of the competition.


CSF is the #1 cooling choice for BMW and particularly F8X M3/M4/M2 Competition owners. With an industry-leading reputation and overwhelming success as the cooling experts, CSF has added the final piece to the already popular F8X Cooling Suite.

Like the other cooling systems on the F8x, the factory auxiliary radiators 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 have pushed the limits of their S55, CSF saw the need and demand. The F8x platform is also almost a decade old with the newest examples being at least 5 years old. Over time the original coolers end up with damaged or clogged fins that greatly reduce their cooling capacity.

CSF designed the coolers to be a true “drop-in fit” for easy installation. 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.

Each CSF F8X Auxiliary Radiator can fit the left or right side. The fitting and plugs are swappable and can be easily setup for either side.

Compared to the OEM F8x coolers, the CSF units are a significant upgrade. CSF eliminated the OE plastic mounting pod by incorporating it into the modular design that fits both sides. This design improvement increases the size of both the core and tanks. The extra space taken from the mounting pod allowed for a ~7% increase in Core Size and an ~10% increase in Tank Volume. With a larger 2-row 42mm core, cooling efficiency and capacity are drastically increased. The high efficiency core using CSF’s Exclusive B-Tube Technology maximizes airflow and heat dissipation. 100% All-Aluminum construction ensures the best performance and durability. The mounting pins and brackets are much stronger and more durable than the OE plastic pod mounting system. In addition, the black finish provides extra protection and offers a stealthy look behind the grilles of your F8x.

In addition, the CSF auxiliary radiators also feature 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.

CSF used a modular design so the auxiliary radiator can fit either side. There are several benefits to this type of design and offers several benefits. One of those benefits is for serious track applications. Having spare parts is always a great idea. Having one auxiliary radiator that fits both sides where you’d normally need one of each is a big cost and space saver. Getting an extra as backup is more cost/space efficient with the CSF units.

The CSF High-Performance Auxiliary Radiator is a direct replacement for BMW part number 17112284603 (left) and/or 17112284604 (right).


  • Sold individually – all applications require 2 auxiliary radiators. 
  • Multi-fit – fits both left & right side.
  • 2-Row 42mm High-Performance core featuring CSF’s B-Tube technology.
  • Ultra-efficient 6.5mm tall fins with a multi-louvered design for maximum surface area contact.
  • Tank volume increased by 10% and core size increased by 6.4%.
  • 100% all-aluminum TIG-welded construction.
  • OEM style inlet/outlet connections.
  • 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.

  • 2 Series / F87 M2 (2016-2021) / M2 Competition
  • 2 Series / F87 M2 (2016-2021) / M2 CS
  • 3 Series / F80 M3 (2014-2019) / M3
  • 3 Series / F80 M3 (2014-2019) / M3 Competition
  • 3 Series / F80 M3 (2014-2019) / M3 CS
  • 4 Series / F82 / F83 (2014-2019) / M4
  • 4 Series / F82 / F83 (2014-2019) / M4 Competition
  • 4 Series / F82 / F83 (2014-2019) / M4 CS
  • 4 Series / F82 / F83 (2014-2019) / M4 GTS

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