Wagner Tuning BMW G80/81 M3 G82 M4 Radiator Kit

Wagner Tuning Competition Radiator Kit – BMW G80/G81 M3, G82 M4 & G87 M2

If you’re pushing your BMW M3, M4, or M2 harder than standard, whether on track, during spirited road driving, or after a tune, keeping coolant temperatures in check becomes increasingly important. This Wagner Tuning Competition Radiator Kit is designed specifically for the S58 engine (the 3.0-litre twin-turbocharged straight-six found in these models) and directly addresses one of its more unique cooling characteristics.

How the S58 Cooling System Works

Unlike many performance engines that cool the charged air (the compressed air fed into the engine by the turbos) using outside air directly, the S58 uses a water-to-air intercooler system. A separate coolant circuit absorbs heat from the compressed charge air before it enters the engine. The cooler that coolant is, the better it can absorb heat, and the cooler, denser air entering the engine, the more efficiently it burns fuel and produces power.

In standard form, the OEM radiator copes well enough for everyday driving. Under sustained high load, such as repeated hard acceleration runs or track sessions, it can begin to struggle. That’s where this Wagner Tuning upgrade comes in.

What This Kit Offers

Wagner Tuning have redesigned the water cooler core from the ground up using their competition racing core technology. The result is a 60% increase in coolant volume capacity compared to the standard unit, achieved by increasing the core thickness from 30 mm to 48 mm while keeping the same external footprint of 505 mm x 605 mm. This means the radiator slots directly into the OEM location without modification, but holds significantly more coolant and transfers heat far more effectively.

The internal and external cooling surface ratio has been carefully balanced so that heat transfer is maximised without restricting airflow to the engine’s main coolant radiator sitting behind it. The cooler also features a thermally conductive anti-corrosion coating, which helps protect the unit long-term and maintains cooling efficiency over time.

Installation

This is a direct-fit, plug-and-play replacement. No cutting, no custom pipework, and no specialist tools required beyond standard workshop equipment. Wagner Tuning include full installation instructions with the kit.

Real-World Benefits

Lower charge air coolant temperatures translate directly to more consistent engine performance, particularly during back-to-back runs or extended track sessions where heat soak (the build-up of heat in the engine and cooling components over time) would otherwise cause the engine management system to pull power back to protect itself.

• 60% greater coolant volume for improved heat absorption
• Direct OEM-fit, no modifications required
• Anti-corrosion coating for long-term durability
• More consistent power delivery during sustained hard use
• Reduced risk of heat-related performance limiting

Note: This kit will not add peak power on its own. Its purpose is to maintain performance under heat load by keeping charge air temperatures stable, which is where most modified or hard-driven S58 engines start to lose their edge.

Fitment

Designed for BMW models fitted with the S58 engine, including the G80/G81 M3, G82/G83 M4, and G87 M2. Please use the vehicle lookup tool or check the Vehicle Fitment tab to confirm compatibility with your specific model and year.