E9X N54/N55 6MT High-Performance Dual Core Aluminum Radiator

Ditch your failure-prone plastic end tanks and increase cooling capacity by 25%, all without modifying your core support or accompanying shrouds. The CSFxTurner Performance Triple-Pass Radiator is the best cooling system upgrade for your N54/N55-equipped BMW!

The BMW 135i and 335i deliver serious performance straight from the factory, thanks to the twin-turbocharged N54 and single-turbo N55 engines. With strong midrange torque, high-revving capabilities, and proven tuning potential, these engines punch well above their weight. However, while the powertrain excels, the factory cooling system often falls short, especially under sustained boost or track conditions. Heat soak, rising coolant temps, and long-term thermal stress are common issues for enthusiasts pushing their N54 or N55 hard, making a performance radiator an essential upgrade for reliability and consistency.

Recognizing the critical need for increased cooling capacity, the team at Turner Motorsport partnered with CSF Race, world leaders in high-performance cooling systems with over 50 years of experience. The result is an Upgraded Performance Radiator: a high-performance, motorsport-grade upgrade engineered to keep your N54/N55 cooler and on the track for longer.

Design:

• CSF-Exclusive "B-Tube" Technology
  • Unlike conventional "O-tube" designs, CSF’s patented "B-tube" structure increases wall strength while creating a more efficient flow path. This alone accounts for a 15% increase in cooling capacity over an OE "O-tube" radiator!
• Dual Core Design
  • 2-Row 42mm Core (Dual Core) Featuring CSF's Exclusive B-Tube Technology.
• Two-Row Compact Structure
  • This radiator was designed with precise fitment in mind. While total tube count and size are increased, the overall radiator dimensions stay the same as OE, ensuring a drop-in fit with zero modifications required. 
• 25% Increase in Cooling Capacity
  • All of the above design features translate to a massive 25% cooling increase over the stock radiator! 

FEATURES & BENEFITS

• Direct-fit upgrade, no modifications required!
• Accepts all OEM attachments via CNC-machined "Quick-Connect" hose ends and accessory mounting provisions
• TIG-welded aluminum construction provides increased durability
• An all-aluminum drain plug replaces the weak OE plastic unit, ensuring seamless functionality for the life of the radiator
• Increased cooling efficiency for high-performance and racing use
• Aluminum drain plug
• Designed and tested by Turner Motorsport in collaboration with CSF Race
• Backed by the Turner Lifetime Replacement Program

Every unit features precision CNC-machined brackets and OE-style connections for a seamless, drop-in installation using factory or aftermarket hoses. Whether you're building a track weapon or a high-horsepower street car, this Turner x CSF radiator is the cooling solution your N54 or N55 needs to perform reliably under pressure. All backed by the Turner Lifetime Replacement Program.