Koyo - Radiator HH Series HH422675 - 01-06 BMW E46

KoyoSKU: HH422675

Sale price$622.00

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Koyorad - Radiator HH Series HH422675 - 01-06 BMW E46

Koyo's "HH" Series radiator core has a 48mm thickness and a high fin density to increase heat transfer effectiveness. Every radiator is designed and produced with precision, making it a direct-fit performance replacement for the stock OE plastic/aluminum radiator. No modifications are needed for installation, allowing for a quick and easy process. Additionally, Koyo has incorporated a 1/8" NPT female accessory fitting (which comes with a threaded plug) to accommodate temperature sensors commonly used with aftermarket temperature gauges.

The quality of Koyorad radiators is maintained through oversight at each stage of production in their privately owned factories in Japan. This guarantees that the quantity of production never compromises the quality. Every all aluminum radiator core from Koyo is meticulously hand assembled, Nocolok brazed, and TIG welded using the highest grade aluminum. These are just a few attributes that have established Koyorad as a trusted and reliable brand for performance radiators worldwide.


  • Koyorad “HH” Series 48mm Hyper Core
  • OE Specific mounting and direct fit
  • Nocolok-R Brazing
  • Precise Tube and Fin alignment
  • Billet aluminum filler neck
  • 1/8” NPT female accessory fitting


2001-2006 BMW M3 3.2L I6 (MT)

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