do88 Auxiliary Radiators - BMW M340i (G20) / Toyota GR Supra 2017-2026 - Pair

The B58 Gen 2 cooling system runs one large central radiator plus a smaller auxiliary radiator in front of each front wheel, and the factory auxiliaries combine slim cores with plastic tanks that heat soak on a tuned engine. do88 replaces both sides with a dual row 40mm aluminium core and TIG welded end tanks, raising core volume and fluid capacity so coolant temperature stays in range on the street, on track and at the strip. Each radiator arrives with CNC machined mounting brackets and OE style quick connect inlet and outlet fittings, and the factory rock guard transfers straight across for stone protection.

Specifications

Documents: Installation Instructions (PDF)

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