Air-to-water heat exchanger for the 2021+ BMW G8X M2, M3 and M4 with automatic transmission, engineered to keep charge air cool under hard use. The all-aluminum design replaces every plastic component with aluminum end tanks, core and CNC-machined ports, TIG-welded for strength, with strutted tubes that resist bowing and flexing during aggressive cornering. A 23 percent larger core volume and 44 percent more external fin surface area, combined with a dual-pass flow configuration and louvered fins, raise cooling capacity well above stock. Steel rock guards are included to protect the core from debris.
| Type | Performance air-to-water heat exchanger |
| Material | All-aluminum, TIG-welded, with CNC-machined ports |
| Core | 23% larger core volume; 44% more external fin surface area; dual-pass, louvered fins |
| Included | Steel rock guards |
| Fit | Direct fit (automatic transmission) |
| Part Number | MMHE-G80-21AT |
| Warranty | Mishimoto Lifetime Warranty |
This part fits:
| Year | Make | Model | Submodel |
|---|---|---|---|
| 2023-2025 | BMW | M2 | Base |
| 2021-2024 | BMW | M3 | Base |
| 2021-2025 | BMW | M3 | Competition |
| 2022-2025 | BMW | M3 | Competition xDrive |
| 2024 | BMW | M3 | CS |
| 2021-2026 | BMW | M4 | Base |
| 2021-2023,2025-2026 | BMW | M4 | Competition |
| 2022-2026 | BMW | M4 | Competition xDrive |
| 2025 | BMW | M4 | CS |
| 2023 | BMW | M4 | CSL |
Shipping: In-stock orders placed before 3 PM EST ship the same day, and everything else ships within 24 hours. Standard, expedited, and overnight options are available at checkout. Backordered items ship as soon as we get them back in stock. Contact us for lead times. See the full Shipping Policy.
Returns: 30-day returns on new, unused items in original packaging. See the full Refund Policy.
