The CSF 00-06 BMW M3 (E46) Race-Spec Dual-Pass Oil Cooler is designed to keep your engine running cool and efficiently. It features a heavy-duty aluminum construction with a two-pass oil cooling system that includes a two-row stacked core with high-efficiency louvered fin technology. The dual-pass design helps reduce oil temperatures up to 30°F, while the stacked core increases the surface area for improved cooling. It also has a CNC-machined billet aluminum end tanks for maximum durability and an integrated thermostat for precise temperature control. The oil cooler is designed to be used with the factory oil filter housing and is compatible with all BMW M3 E46 models.