Koyorad KV423704 Front-Mount Heat Exchanger: BMW M3 (F80), M4 (F82/F83) and M2 Competition (F87)
Application: BMW M3 (F80) / M4 (F82/F83) / M2 Competition (F87) | S55B30T0 3.0L Twin-Turbo Inline-6 | Manual & M-DCT
Part Number: KV423704
The Koyorad KV423704 is an all-aluminium front-mounted heat exchanger for the S55 charge-cooler circuit. It cools the coolant used by the water-to-air intercooler and is separate from the main engine-cooling radiator.
Koyorad's catalogue specifies a 36 mm core for KV423704, with dimensions of 535 x 430 x 36 mm. The catalogue cross-references BMW part number 1711 2 284 608 and CSF 8075.
Why Koyorad?
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Precise Tube & Fin Alignment — Strict quality control ensures optimal coolant flow and maximum heat transfer efficiency across the entire core.
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Nocolok Furnace Brazing — All tubes, fins, headers, and brackets are bonded in a state-of-the-art Nocolok furnace, creating a structure that resists vibration, road debris, and the elements.
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Hand-Crafted Heliarc Welds — Each radiator is individually Heliarc welded by hand, creating the strongest possible aluminium-to-aluminium bond across all components.
