do88 Transmission Cooler - BMW M340i (G20) / Toyota GR Supra (A90) 2018-2026

The ZF 8HP behind the B58 runs an external liquid to air transmission cooler from the factory, and on tuned cars that cooler runs out of capacity on track, on the strip and in hard street use. do88 redesigned the core to raise volume by 184% and active cooling area by 176% while holding similar fluid pressures, using harmonica tubes with internal channels for oil flow and surface contact. The inlet and outlet keep the OEM style quick connect fittings so it is a drop-in change with no modification, and it is compatible with the do88 WC-400 front intercooler radiator.

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