The Mishimoto automatic transmission cooler for the 2020-2025 Toyota GR Supra 3.0L, and BMW B58 models including the M340i and Z4, supplements the factory liquid-to-air cooler on the ZF 8HP transmission to handle the heat of track days and spirited driving. Mishimoto expanded the core for a 162% increase in volume and 412% greater external fin surface area while keeping similar system fluid pressures, and added internal cooling fins for maximum heat transfer. The lightweight aluminum tube-and-fin core is finished in a sleek silver powder coat.
Specifications
| Type | Supplemental automatic transmission cooler |
| Transmission | ZF 8HP (B58 platform) |
| Core | Aluminum tube-and-fin, internal cooling fins |
| vs. Stock | +162% core volume, +412% external fin area |
| Finish | Silver powder coat |
| Part Number | MMTC-SUP-20 |
| Warranty | Mishimoto Lifetime Warranty |
This part fits:
| Year | Make | Model | Submodel |
|---|---|---|---|
| 2020-2025 | BMW | M340i | Base |
| 2020-2021 | BMW | M340i xDrive | Base |
| 2020 | BMW | Z4 | M40i First Edition |
| 2020-2021 | BMW | Z4 | sDrive M40i |
| 2019-2021 | BMW | Z4 | sDrive30i |
| 2024 | Toyota | GR Supra | 45th Anniversary Edition |
| 2021-2022 | Toyota | GR Supra | A91 Edition |
| 2023 | Toyota | GR Supra | A91-MT Edition |
| 2020-2022 | Toyota | GR Supra | Base |
| 2020 | Toyota | GR Supra | Launch Edition |
| 2020-2022 | Toyota | GR Supra | Premium |
Shipping
- Orders placed before 3 PM EST typically ship the same business day. Larger items ship within 1 to 3 business days.
- Standard, expedited, and overnight options at checkout.
- Oversized items ship by freight and take longer.
- Special order items follow a lead time we confirm with you individually before the order is committed.
- Backordered items ship as soon as stock lands. Lead times are manufacturer estimates and can change. Contact us for current ETAs.
- Need to cancel? Email us right away. Cancellations are not guaranteed once an order is in process. In-stock orders cancel free before they ship; a 6% fee applies only to confirmed backorders and special orders.
- 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 days from delivery to request and ship back a return on new, uninstalled items in original packaging with all hardware.
- Standard returns: 8% restocking fee on the item price before tax and shipping. Shipping is not refunded in either direction. All waived if the item is defective or we made the error.
- Fitment guaranteed: select your vehicle above, or confirm fitment with us in writing before you order. If the part shows as a fit and it is wrong, the return is on us, even after installation. Otherwise, installed or used parts cannot be returned.
- Final sale: special orders, coilovers, electronics, engine internals, turbochargers, superchargers and turbo kits, unless defective or we sent the wrong item.
- Product images may be representative. The SKU and specifications in the listing are what ships.
- Email us for return authorization before shipping anything back.
Full details: Shipping Policy · Returns & Refunds · Warranty
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