CSF High-Performance Auxiliary Radiator - Toyota GR Supra / BMW Z4, M240i, M340i, M440i (2019-2026, Left or Right, Two Required)

CSF High-Performance auxiliary radiator for the 2020+ Toyota GR Supra and its BMW B58 siblings, the Z4, M240i, M340i and M440i. CSF redesigned the included detachable aluminum rock guard so it doesn't block core surface area the way the OEM plastic guard does on an aftermarket core, validated in CSF's in-house wind tunnel. The unit runs a 2-row 42mm ultra-high-performance core with CSF's exclusive B-Tube technology and 6.5mm multi-louvered fins, in 100% all-aluminum TIG-welded construction with a thermal black protective coating. CNC-machined brackets and OEM-style quick-connect fittings make it a true drop-in fit on both the left and right side; two are required per vehicle.

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