CSF High-Performance Aluminum Radiator - BMW E46 323i/325i/328i/330i & Z4 (1999-2005)

A high-performance, all-aluminum radiator for the 1999-2005 BMW E46 3-Series (323i, 325i, 328i, 330i, including xi models) and the 2003-2005 Z4, built for high-horsepower street and track builds. It runs a 2-row 42mm core with CSF's exclusive B-Tube technology, which increases each tube's heat-transfer surface area by roughly 15% over conventional round tubes. Ultra-efficient 6.5mm multi-louvered fins maximize airflow, while CNC-machined brackets and quick-connect inlet/outlet fittings give a drop-in fit that accepts all OEM components. Finished in a smooth satin finish with an all-aluminum race-style drain plug.

Specifications

This part fits:

Shipping

• In-stock orders placed before 3 PM EST ship the same day — everything else ships within 24 hours.
• Standard, expedited, and overnight options at checkout.
• Oversized items ship by freight and take longer.
• Backordered items ship as soon as stock lands — contact us for lead times.
• International orders: prices do not include VAT, duties, or import fees. Your country charges these at import and they are the buyer’s responsibility.

Returns

• 30-day returns on new, uninstalled items in original packaging with all hardware.
• Standard returns: 8% restocking fee, buyer pays return shipping. Both waived if the item is defective or we made the error.
• Installed or used parts can’t be returned — confirm fitment before you install.
• Special orders and custom items are final sale.
• Email us for return authorization before shipping anything back.

Full details: Shipping Policy · Refund Policy