Wagner Tuning BMW M3 M4 F80 F82 F83 S55 Auxiliary Side-Mount Radiator - Low Temp Charge Cooler/Intercooler Water Heat Exchanger Upgrade | F8X Performance Cooling, Direct Fit

BMW F80 F82 F83 M3/M4 Auxiliary Water Radiator Upgrade - Wagner Tuning

Unlock dependable cooling performance for the S55B30 twin-turbo platform with this side-mount low-temperature circuit radiator from Wagner Tuning. By expanding the capacity and surface area of the charge-cooler water circuit, this uprated heat exchanger helps control intake charge temperatures, fights heat soak and keeps power consistent on fast-road drives and track sessions.

Why this cooling upgrade

• Massive capacity increase: 3.2 L vs 1.65 L - that is a 94 percent gain over the factory side radiator
• Larger face area: up by 14.9 percent for stronger heat rejection
• Competition-grade core designed for maximum heat transfer while maintaining airflow to surrounding components
• Heat-conductive anti-corrosion coating for long-term durability
• Direct-fit, plug-and-play installation with supplied hardware and instructions
• Carbon air shroud included to channel airflow efficiently

Dimensions and specs

OEM side radiator: 250 x 165 x 40 mm (9.8 x 6.5 x 1.6 in) - Volume 1.65 L - Area 412.5 cm² (63.7 in²)

Wagner side radiator: 252 x 188 x 68 mm (9.9 x 7.4 x 2.7 in) - Volume 3.2 L (+94%) - Area 473.8 cm² (73.3 in²) (+14.9%)

What is included

• 1 x side-mount radiator for the low-temperature charge-cooler circuit
• 1 x carbon air shroud
• Mounting materials
• Installation instructions

Real-world results with MJ Modifications

We have fitted this to customer F8x cars and on our own builds. Feedback has been excellent, with noticeably steadier temperatures and repeatable performance during hard use.

Professional fitting

Want it installed by specialists? Book your car in at MJ Modifications, Warwickshire. Email info@mjmodifications.co.uk for a fitting quote.

Compatibility and key search terms

Fits BMW M3 F80 and BMW M4 F82/F83 with the S55 engine. Also searched as: auxiliary radiator upgrade, charge-cooler water radiator, low-temp heat exchanger, side radiator, performance cooling kit, uprated radiator, BMW F8x cooling upgrade, S55 cooling system, track-day cooling, fast-road cooling, intercooler water radiator, secondary radiator, direct replacement radiator, bolt-on cooling mod, Wagner competition radiator.