Wagner Tuning Competition Side Mount Low-Temp Radiator BMW M3/M4 F80 F82 F83 F8X (2014-2020) S55 Charge Cooler Water Radiator Upgrade | Plug & Play, Carbon Air Shroud

High-Capacity Auxiliary Water Cooler for BMW F8x M3 and M4 S55

Keep intake temperatures stable and power consistent with this genuine Wagner Tuning side-mounted auxiliary water radiator for the S55-powered BMW F80 M3, F82 M4 and F83 M4. It is a direct-fit drop-in upgrade for the water-to-air chargecooler circuit that tackles heat soak, supports hard driving and helps your M car deliver repeatable performance on fast road and track.

Real-world benefits

• Bigger cooling core for the chargecooler loop that improves thermal control under sustained load
• Reduced heat soak on tuned and remapped S55 engines, ideal for stage 1 and stage 2 power levels
• Carbon fibre air guide included to channel airflow through the core for maximum efficiency
• Anti-corrosion coated core and end tanks for durability in UK road conditions
• OEM-style fitment with no cutting or trimming, maintains airflow to surrounding coolers

Technical details

Compared to the factory side radiator, the upgraded core offers a substantial leap in volume and frontal area for greater heat rejection from the intercooler water circuit.

Factory side radiator size: 250 mm x 165 mm x 40 mm
Capacity: 1.65 litres
Frontal area: 412.5 cm²

Upgrade side radiator size: 252 mm x 188 mm x 68 mm
Capacity: 3.2 litres increase of approximately 94 percent
Frontal area: 473.8 cm² increase of approximately 14.9 percent

The optimised internal and external fin geometry enhances heat transfer while preserving flow to the main cooling package, helping maintain stable coolant temperatures for the water-to-air intercooler system.

Compatibility

• BMW M3 F80 3.0 S55 saloon
• BMW M4 F82 3.0 S55 coupé
• BMW M4 F83 3.0 S55 convertible
• Model years 2014 to 2020 F8x platform

What you receive

• Side-mounted auxiliary water radiator for the low temperature circuit
• Carbon fibre air duct for the auxiliary cooler
• Mounting hardware kit
• Installation instructions

Why enthusiasts choose this upgrade

We have installed this on customer cars and our own builds and feedback has been excellent. Drivers report lower intake temps, improved consistency on repeated pulls and better resilience during hot weather and track days. It is a trusted solution for S55 cooling headroom when power is increased or the car is driven hard.

Fitting and support

Designed for a straightforward plug-in installation using factory hose connections and brackets. For professional fitment, contact MJ Modifications in Warwickshire to book your car in or request a quote at info@mjmodifications.co.uk.

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