F20 F30 F32 F36 CSF B-Tube Aluminium Radiator for Stage 1-2 Fast Road & Track Day Use, Part No CSF-8412

For F20, F30, F32 and F36 owners running N13, N20 or B48 engines - especially those pushing stage 1 or stage 2 power, chasing fast road stability or running back-to-back track day laps - this CSF B-Tube radiator delivers measurable thermal headroom over stock.

• Direct-fit for automatic-transmission F-series (not manual or i3)
• B-Tube core design: higher surface area and improved coolant flow vs. OEM’s serpentine core - critical under sustained load
• All-aluminium, TIG-welded: no plastic tanks to warp or leak; built for heat cycling, not showroom shine
• CSF part number 8412: matches factory mounting, hose ports and expansion tank routing - no adapters needed
• Proven on N20-powered F30s with MHD stage 2 + charge pipe upgrades, and B48 F36s with JB4 + decat downpipes

Not a show car piece. Not an OEM replacement. It’s a thermal upgrade - because race car.