CSF BMW High-Performance Auxiliary Radiator
The auxiliary radiators are the smaller coolers mounted behind the front bumper that help the main system shed heat, and on the S58 cars they matter more than people expect once power goes up. The factory units are fine stock, but they run plastic end tanks that crack and fins that clog and bend over time, and they turn into a real limiter on a tuned car or a hot track day. This CSF radiator replaces the OE unit with a 2 row 42mm core built on CSF's B tube design and their latest 5mm fin, paired with TIG welded aluminum tanks that are larger than the stock plastic ones, so it holds more coolant and pulls more heat out of the system.
It is 100 percent aluminum with aluminum mounting pins and brackets in place of the brittle OE plastic pod, so it mounts more securely and lasts longer. The radiator is a true drop in fit that goes in the factory location and uses the OEM quick connect lines, and an integrated bolt on rock guard protects the core from stones and track debris, which is exactly how the stock units tend to get punctured and dump coolant. The black finish keeps it discreet behind the grilles.
Worth knowing before you order: each radiator fits either side of the car, but they are sold individually and a full car uses two. It fits the S58 powered G8X cars, covering the G80 M3, the G82 and G83 M4, and the G87 M2. Every unit is leak and pressure tested before it ships, and it holds up whether the car is a daily driver, a weekend track car, or a high power build fending off heat soak and limp mode when temps climb.
FITMENT
- G80 M3
- G82 / G83 M4
- G87 M2
