Koyorad Performance Radiator: BMW M3 E46 3.2L I6 2001-2006
Koyorad Performance Radiator: BMW M3 E46 3.2L I6 2001-2006 is backordered and will ship as soon as it is back in stock.
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Koyo Performance Radiator – BMW E46 M3 S54 3.2L I6 MT/SMG 2001–2006
Application: BMW M3 | E46 (Coupe / Convertible / CSL) | S54B32 3.2L I6 | 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?
- Precise Tube & Fin Alignment — Optimal coolant flow and maximum heat transfer efficiency.
- Nocolok Furnace Brazing — All components bonded as one unit for vibration and debris resistance.
- Billet Filler Neck — Precision-machined for strength, durability, and a reliable seal.
- OE-Specific Mounting — Retains factory fan shroud, hose positions, and mounting pins.
- Hand-Crafted Heliarc Welds — Individually welded for the strongest possible aluminium-to-aluminium bond.
Specifications
| Part Number | HH422675 / KH422675 |
| Core Thickness | 48mm |
| Core Dimensions (H x W) | 580 x 394/426mm |
| Tube Pitch | 55/55 x 414mm |
| Inlet / Outlet | 38mm top and bottom |
| Construction | All Aluminium, Nocolok Brazed, Heliarc Welded |
| Transmission | Manual & SMG |
| BMW OEM | 1710 2 228 941 |
Fitment
| Year | Model | Chassis | Submodel |
|---|---|---|---|
| 2001-2006 | BMW M3 | E46 Coupe | S54B32 3.2L I6 MT/SMG |
| 2001-2006 | BMW M3 | E46 Convertible | S54B32 3.2L I6 MT/SMG |
| 2003 | BMW M3 CSL | E46 Coupe | S54B32 3.2L I6 SMG |
Sold individually. Lead times may apply — contact us at ModsDirect for availability and shipping estimates.
ModsDirect is an Authorised Australian Distributor of Koyorad Performance Radiators.
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