Koyo Performance Radiator – BMW E46 M3 S54 3.2L MT/SMG 2001–2006
Application: BMW M3 | E46 (Coupe / Convertible / CSL) | S54B32 3.2L | Manual & SMG
Part Number: HH422675 / KH422675
The E46 M3 is widely regarded as one of the finest driver's cars ever produced — a naturally aspirated S54 straight-six that revs freely to 8,000rpm and a perfectly balanced chassis that remains a benchmark for driver engagement. The S54 generates significant heat at high rpm and under sustained track use, making a quality cooling upgrade a worthwhile investment for any E46 M3 owner pushing the car hard.
Koyorad's all-aluminium radiator is a direct bolt-in upgrade for the E46 M3. Nocolok furnace brazed, TIG welded by hand, and triple pressure tested — retains all OEM fan shroud mounts and hose connections with no modifications required.
Why Koyorad?
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Precise Tube & Fin Alignment — Optimal coolant flow and maximum heat transfer efficiency.
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Nocolok Furnace Brazing — All components bonded as one unit for vibration and debris resistance.
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Billet Filler Neck — Precision-machined for strength, durability, and a reliable seal.
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OE-Specific Mounting — Retains factory fan shroud, hose positions, and mounting pins.
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Hand-Crafted Heliarc Welds — Individually welded for the strongest possible aluminium-to-aluminium bond.
