The Mishimoto 99-06 BMW 323i/323i/328i/330i w/ Auto Transmission Performance Aluminum Radiator is designed to provide maximum cooling efficiency to your BMW's engine. This aluminum radiator is engineered to maximize cooling efficiency by up to 30%, boost engine functions, and protect your car from overheating. It features a lightweight dual core, 100% brazed aluminum, and polished end tanks, providing your vehicle with optimal heat dissipation. The radiator includes a magnetic drain plug and a 1.3 bar high-pressure radiator cap. It also includes a Mishimoto Lifetime Warranty for maximum protection.