BMW Z4 Auxiliary Radiators - Mishimoto - Performance Aluminum - Polished - `18-`27. Upgrade your Z4’s cooling support with a polished pair of auxiliary radiators built for demanding street and track conditions.

These Mishimoto units replace the slim stock cores and plastic end tanks with full aluminum, TIG-welded construction for durability and consistent performance. The efficiently brazed cores measure 1.57 inches thick, delivering a 30% increase in core volume over stock. An updated tube-and-fin design expands external fin surface area by 180% to improve heat dissipation, especially when paired with the Mishimoto Performance Aluminum Radiator. Strutted tubes reinforce the core for stability and reduced risk of leaks. Includes Mishimoto’s Lifetime Warranty.

Features

• 1.57 in thick, efficiently brazed aluminum cores
• Full aluminum, TIG-welded construction
• 30% increase in core volume vs. stock
• 180% increase in external fin surface area
• Strutted tubes for strength and longevity
• Polished finish
• Sold as a pair
• Application: BMW Z4; also fits 2020+ Toyota GR Supra 3.0L
• Part number: MMRAD-SUP-20A
• Mishimoto Lifetime Warranty

Have questions or planning a build? Call our experts at 512-982-9393 (Austin, TX) or 562-981-6800 (Los Angeles, CA). We offer installation and customization services at both locations.

If you’re considering multiple items, contact us for combined shipping discounts.

We install on premises at both locations.

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