do88 Auxiliary Radiator BMW M2/M3/M4 (G8X)
Improve the performance of your 2021+ BMW G8X M2, M3, or M4 engine with the do88 Performance Auxiliary Radiator. This upgrade helps manage engine temperatures effectively, especially during spirited driving or track days.
The Importance of Auxiliary Radiators
The S58 engine in your BMW features a cooling system with three frontal radiators, including one large central radiator and two smaller auxiliary radiators located near each wheel. When engines are tuned for higher performance, they generate more heat. The factory auxiliary radiators, with their slim cores and plastic tanks, may not handle this heat effectively, leading to potential overheating.
Our Solution
The do88 Performance Auxiliary Radiators are designed to fit perfectly in place of the original equipment (OE) radiators. Here are some key benefits:
- 43% larger core volume than the OE radiators for greater cooling capacity.
- 48mm thick, 2-row core that increases active cooling area by 13%.
- Full aluminium construction with durable TIG-welded end tanks for long-lasting performance.
- Increased fluid capacity for better heat dissipation.
We recommend installing both left and right radiators simultaneously, as upgrading just one side may not deliver optimal results.
Easy Installation
Installation is straightforward, as our radiators come with CNC-machined mounting brackets and OE-style “Quick Connect” inlet/outlet connections. The original rock guard can be easily fitted to protect against road debris.
Fitment
This auxiliary radiator is compatible with the following models:
- BMW M2 (G87) – Engine: S58 – Model years: 2023 onwards
- BMW M3 / M3 Competition / M3 CS (G80) – Engine: S58 – Model years: 2020 onwards
- BMW M4 / M4 Competition / M4 CSL (G82) – Engine: S58 – Model years: 2020 onwards
To ensure proper fitment for your vehicle, please use the vehicle lookup functionality or check the “Vehicle Fitment” tab for details.







