Wagner Tuning Side Mounted Radiator Kit for F8x M3 and M4

Wagner Tuning developed the Competition water cooler kit to resolve a key cooling limitation in the 3.0-liter S55B30 turbo engine used in the BMW M3 and M4. This engine operates with an indirect intercooler system in a low-temperature circuit, where coolant temperature has a direct impact on performance. By combining a front and side water cooler, Wagner Tuning dramatically increases the system’s cooling capacity. The side cooler alone expands coolant volume by 94%, complemented by an additional 89% increase from the front cooler, resulting in a substantial reduction in operating temperatures. This enhanced thermal control enables the engine management system to maintain higher and more consistent power output, making the kit an ideal solution for high-performance driving, tuned setups, and track-focused applications.

Why the Wagner Tuning Radiator is the Best Choice for Your S55

• Wagner Tuning’s side water cooler delivers a significant performance upgrade with an impressive 94% increase in cooler volume within the low-temperature circuit compared to the factory unit. It effectively reduces coolant temperatures in the indirect intercooler circuit, improving intercooler efficiency and preventing heat-related power loss caused by heat soaking. Built around Wagner Tuning’s high-performance Competition intercooler core technology, the system ensures maximum heat transfer while maintaining optimal airflow, further enhanced by the included carbon air duct for the side radiator. For long-term durability, the cooler features a heat-conducting anti-corrosion coating that provides reliable and consistent cooling performance. The kit is fully approved and legal, now supplied with a parts certificate for safe and uncomplicated registration, and installation is straightforward thanks to its virtually plug-and-play design and detailed instructions.

Features

• Increases coolant volume by approximately 94% over the factory side cooler
• High-performance competition radiator core for improved heat dissipation
• Helps lower coolant temperatures and reduce heat soak
• Improves intercooler efficiency and overall thermal stability
• Includes carbon fiber air duct for optimized airflow
• Heat-conductive anti-corrosion coating for long-term durability
• Direct replacement with near plug-and-play installation
• Includes all necessary mounting hardware and instructions

Specifications

• Dimension: 252mm x 188mm x 68mm
• Volume: 3.2 Liters (+94% vs OEM)
• Surface Area: 473.8cm² (+14.9%)

Applications

• BMW M3: F80 | 2014-2018 | S55 3.0L I6 twin-turbo
• BMW M4: F82, F83 | 2014-2020 | S55 3.0L I6 twin-turbo

About Wagner Tuning

Wagner Tuning is a Germany-based performance engineering brand specializing in high-efficiency charge-air cooling and intake solutions for modern turbocharged vehicles. Known for its competition-proven intercoolers and precision-manufactured components, Wagner Tuning combines advanced R&D, CFD analysis, and rigorous testing to deliver measurable performance gains, improved thermal stability, and long-term reliability. With a strong focus on motorsport-inspired engineering and OEM-level fit and finish, Wagner Tuning products are designed to support both high-performance street driving and demanding track use across a wide range of European and international platforms.