BMW M3 Coolant Expansion Tank - Moroso - Direct Bolt-In Replacement - `01-`06. This Moroso expansion tank is a direct replacement designed for the BMW E46 M3 (2001–2006), offering a dependable option when the factory tank shows age or failure. It installs using the stock mounting points and hose connections for a straightforward swap.

Built by Moroso to serve as a like‑for‑like replacement, this coolant expansion tank restores proper coolant reservoir function without requiring modification. It is intended for owners who want a reliable, replacement reservoir that maintains fitment and serviceability. The design targets compatibility and ease of installation, making it suitable for daily drivers and enthusiasts who perform routine maintenance or mid‑level upgrades.

Features

• Direct bolt-in replacement specifically for BMW E46 M3 (2001–2006)
• Maintains original mounting points and hose connections
• Manufactured by Moroso to meet replacement fit and function
• Simple installation—no vehicle modification required

If you have questions about fitment or installation, please call us directly—our experts can help confirm compatibility and discuss installation options. We have two locations where we offer installation and customization services: Austin, Texas and the Los Angeles, California area. Call us at 512-982-9393 (TX) or 562-981-6800 (CA) to schedule or for more information. If you are thinking about purchasing multiple items, contact us for shipping discounts. We install on premises at both locations.

CA Residents: WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov