Description
The Mishimoto Performance Heat Exchanger (MMHE-G80-21AT) is purpose-built for the 2021+ BMW G8X platform, replacing the factory air-to-water intercooler heat exchanger with an all-aluminum unit that eliminates plastic components entirely. Every end tank, core, and CNC-machined port is TIG-welded together, and strutted tubes are built into the core to resist bowing and flexing under aggressive cornering — a level of durability the stock unit simply wasn’t designed for.
This Mishimoto cooling upgrade was engineered from scratch to push more heat out of your charge air. Compared to the factory piece, core volume is increased by 23 percent and external fin surface area is expanded by 44 percent, while a dual-pass flow configuration paired with a louvered fin design drives a meaningful jump in cooling capacity over stock. CNC-machined inlet and outlet ports help ensure a leak-free connection, and the unit bolts in alongside all other factory components for a clean, seamless installation on both automatic and manual transmission cars. Removable steel rock guards are included to shield the heat exchanger from road debris, protecting against punctured tubes or crushed fins.
Vehicle Applications
This heat exchanger is engineered for BMW’s S58B30 twin-turbo inline-six as installed in the G80, G82, G83, and G87 chassis. Coverage includes the BMW M2 Base (2023–2026), M2 Coupe (2023–2024, 2026), and M2 CS (2026); the M3 Base (2021–2024, 2026), M3 Competition (2021–2026), M3 Competition xDrive (2022–2026), and M3 CS (2024); and the M4 Base (2021–2026), M4 Competition (2021–2023, 2025–2026), M4 Competition Heritage (2023), M4 Competition xDrive (2022–2026), M4 CS (2025–2026), and M4 CSL (2023). Installation requires removal of the passenger-side stock rock guard tab, as detailed in step 11 of the Mishimoto installation guide.
Features
- Fits 2021+ BMW G8X M2/M3/M4 models with the S58B30 engine
- 23 percent increase in core volume improves cooling capacity
- 44 percent increase in external fin surface area for greater heat transfer
- Dual-pass design for maximum cooling
- Strutted tubes incorporated in the core for maximum durability
- CNC-machined inlet and outlet for leak-free running
- Includes removable steel rock guards for additional durability
- Fits both automatic and manual transmission vehicles
- Backed by the Mishimoto Lifetime Warranty
Specifications
- Material: 6061-Aluminum
- Core Height: 19.52 in
- Core Length: 24.21 in
- Core Thickness: 1.65 in
- Overall Height: 20.17 in
- Overall Length: 28.66 in
- Overall Width: 2.78 in
- Fluid Capacity: 0.51 gal
- Includes: (1) Performance Aluminum Heat Exchanger, (1) Upper Rock Guard, (1) Lower Rock Guard (MT Only), (1) Hardware Pack, Mishimoto Lifetime Warranty
- Installation Note: Requires removal of the passenger side stock rock guard tab — refer to step 11 of the installation guide
Frequently Asked Questions
What vehicles is the Mishimoto MMHE-G80-21AT heat exchanger designed for?
It is designed for 2021+ BMW G8X chassis vehicles powered by the S58B30 engine, covering the M2 Base, M2 Coupe, M2 CS, M3 Base, M3 Competition, M3 Competition xDrive, M3 CS, M4 Base, M4 Competition, M4 Competition Heritage, M4 Competition xDrive, M4 CS, and M4 CSL across their listed model years.
Does this heat exchanger work with both automatic and manual transmission BMWs?
Yes, the Mishimoto G8X M2/M3/M4 performance heat exchanger fits both automatic and manual transmission vehicles.
What is the heat exchanger made from?
It is constructed from 6061-Aluminum, with all end tanks, core, and CNC-machined ports TIG-welded together with no plastic components.
How much more cooling capacity does this offer compared to the factory heat exchanger?
Core volume is increased by 23 percent and external fin surface area is increased by 44 percent, and combined with a dual-pass flow configuration and louvered fin design, cooling capacity is vastly improved over stock.
What is included with the Mishimoto Performance Heat Exchanger?
It includes one Performance Aluminum Heat Exchanger, one Upper Rock Guard, one Lower Rock Guard (manual transmission only), a Hardware Pack, and the Mishimoto Lifetime Warranty.
Are there any special installation steps for this heat exchanger?
Yes, installation requires removal of the passenger side stock rock guard tab; refer to step 11 of the installation guide for details.
âš WARNING (California Proposition 65): This product can expose you to chemicals known to the State of California to cause cancer and/or birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov.
