DESCRIPTION
Upgrade charge-air cooling with the do88 Intercooler. ICM-450-K fits BMW M2/M3/M4 S58 (G80/G82/G87).
Enhance Your S58 Engine’s Performance with the do88 Charge Cooler Manifold
Background
The BMW S58 engine, introduced with the G80/G82 M3 and M4 from 2021 onward, has quickly proven itself as an exceptionally capable and characterful powerplant. While highly efficient in stock form, certain components become limiting factors when pursuing higher performance levels and improved long-term reliability.
The S58 is equipped with a water-to-air charge air cooling system integrated directly into the intake manifold, paired with a front-mounted heat exchanger. This system cools the water circulating through the charge cooler, which in turn reduces the temperature of the intake air before it enters the engine.
Challenges with the Factory Components
Integrating the charge air cooler into the intake manifold results in a compact and complex design that demands high precision from aftermarket manufacturers. While effective in principle, the factory system relies on a tube-and-fin core crimped into thermoplastic end tanks.
These crimped joints have proven to be a weak point, with numerous failures reported at boost pressures only slightly above factory levels. For tuned S58 engines, rapid heat soak is another common issue—especially during track use—leading to elevated intake air temperatures, power reduction, or even limp-home mode activation.
Additionally, while the factory direct injection system offers clear benefits, it becomes restrictive for extreme horsepower goals or ethanol-based fuel setups. Many enthusiasts resort to modifying the OE intake manifold by drilling for auxiliary port fuel injectors.
As is often the case, factory components can become airflow bottlenecks when pursuing high power levels. The OE plastic intake manifold not only restricts airflow but also carries a significant risk of cracking under elevated boost pressures.
The do88 Solution
High-Performance Bar & Plate Core
The do88 charge cooler manifold features a motorsport-grade Bar & Plate air-to-water core with densely stacked cooling fins for exceptional heat transfer. The core is 127 mm (5") thick and specifically optimized for this application, offering an impressive 62% increase in core volume compared to stock.
Both air-side and water-side fin designs have been carefully evaluated to achieve the optimal balance between cooling efficiency and airflow.
Innovatively Designed Cast End Tanks
To ensure even distribution of both charge air and cooling water across the entire core, the manifold utilizes carefully engineered cast end tanks. Development involved 3D scanning, multiple design iterations, CFD analysis, and 3D-printed prototypes before final validation.
Casting was chosen over CNC machining, as it allows for more complex internal geometries that better serve airflow and cooling performance. At do88, function and performance always take precedence over cosmetic appeal.
Intercooler Features:
Versatile Manifold Design – Fueling and Power Expansion Ready
The outlet tank is pre-configured for auxiliary port fuel injection. A custom fuel rail with female AN-8 threads is included and bolts directly to the outlet tank. The system supports Injector Dynamics ID1050x-34-14 or Bosch EV14 (short) injectors.
For users not running port injection, injector blanking plugs are included. Each cylinder runner also features an individual 1/8” NPT port, suitable for nitrous oxide or methanol injection—popular power enhancements for the S58 platform. Sealing plugs are included.
Additional Measurement & Vacuum Ports
A 3-port sensor pad is integrated into the side of the outlet tank, providing three additional 1/8” NPT ports. These can be used for pressure sensors, temperature probes, or vacuum sources. Sealing plugs are supplied if unused.
Advanced Thermal Management
Included is a specially engineered thermal barrier spacer designed to insulate the aluminum intake manifold from conductive heat transfer from the cylinder head. This reduces intake air temperatures, improves charge cooler efficiency, and minimizes heat soak.
Unlike the OE plastic intake manifold, the do88 unit is constructed from aluminum to withstand significantly higher boost pressures. The thermal spacer counters aluminum’s natural heat conductivity using custom-designed, high-spec FKM silicone O-rings installed in precision-machined grooves, providing a superior seal compared to traditional gasket or sealant-based solutions.
Product Details
- High-performance Bar & Plate air-to-water intercooler core, 127 mm (5") thick.
- Lower intake air temperatures compared to OE: 28.5 °C vs 33 °C (see diagrams under product images).
- Improved airflow and reduced backpressure: 511 CFM vs 422 CFM at 0.05 bar / 0.73 psi pressure drop – 21% increase.
- Designed in SolidWorks using Computational Fluid Dynamics (CFD).
- Easy access to the spin-off oil filter – no need to remove the manifold during oil changes.
- Integrated sensor pad with three 1/8” NPT ports (sealing plugs included).
- Auxiliary top-feed port injection fuel rail included.
- Injector blanking plugs included for each cylinder runner.
- Individual 1/8” NPT ports on each runner for nitrous or methanol injection.
- Plug-and-play installation – see included instructions.
- All necessary brackets for wiring and ancillary components included.
- Thermal barrier spacer included for reduced conductive heat transfer.
- Custom high-spec FKM silicone O-rings included (12 pcs total).
OE Reference Number
17518092584
Vehicle Fitment:
Model: BMW M2 (G87)
Engine: S58
Model years: 2023–202X
Model: BMW M3 / M3 Competition / M3 CS (G80)
Engine: S58
Model years: 2020–202X
Model: BMW M4 / M4 Competition / M4 CSL (G82)
Engine: S58
Model years: 2020–202X
TECHNICAL DETAILS
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