The Mishimoto Performance aluminum radiator for 1999–2006 BMW E46 non-M 323i/328i/330i models is a direct-fit upgrade featuring a two-row brazed-aluminum core and polished end tanks. Engineered to improve cooling, it reduces coolant temperatures by about 19°F versus stock, increases coolant capacity and surface area, and is available in manual and automatic versions with an auxiliary inlet on auto models for the transmission cooler hookup.
Mishimoto 99-06 BMW 323i/323i/328i/330i Performance Aluminum Radiator