CSF Mercedes AMG GT / GT S / W205 C63 / W166 GLE63 / X166 GLS63 Auxiliary Radiator

The CSF Mercedes AMG GT / GT S / W205 C63 / W166 GLE63 / X166 GLS63 Auxiliary Radiator is a meticulously engineered component designed to enhance the cooling efficiency of high-performance Mercedes-Benz AMG vehicles. Constructed entirely from high-grade aluminum, this auxiliary radiator integrates seamlessly with the existing cooling system to effectively reduce temperatures across critical engine and turbocharger components. This is essential for maintaining optimal performance and reliability, especially under demanding driving conditions.

Functioning as a vital part of the cooling architecture, the auxiliary radiator not only lowers engine coolant temperatures but also serves as the heat exchange medium for the air-to-water charge-air coolers associated with the turbocharger system. By reducing intake air temperatures (IATs), it contributes directly to improved combustion efficiency and power delivery. The increased capacity of the CSF auxiliary radiator extends the heat soak threshold, thereby sustaining temperature stability and preventing performance degradation during prolonged or aggressive use.

One of the distinguishing features of this CSF auxiliary radiator is the inclusion of a detachable rock guard. This protective element guards against debris accumulation and potential core punctures, a notable improvement over OEM auxiliary radiators which typically lack adequate protection from environmental hazards. This design consideration ensures durability and longevity, reinforcing CSF’s commitment to quality and reliability.

For optimal cooling performance, CSF recommends replacing both left and right OEM auxiliary radiators with this product in vehicles originally equipped with dual units. Furthermore, pairing these auxiliary radiators with the CSF Front Mount Heat Exchanger (CSF #8088) maximizes thermal management capabilities, delivering comprehensive temperature control across the vehicle’s cooling system.

Product Details

Following the success of CSF’s #1 selling Front Mount Heat Exchanger for the W205 Mercedes AMG, the demand for additional Mercedes-Benz cooling solutions prompted the development of a complete lineup of advanced cooling products tailored for AMG models. This auxiliary radiator represents a key component of that expansion, targeting the prevalent heat soak issues experienced by AMG vehicles, particularly in warmer climates.

AMG vehicles are known to experience heat soak, which can compromise performance and component longevity. The CSF auxiliary radiator addresses this challenge by significantly improving heat dissipation, thereby enhancing the vehicle’s thermal resilience. This product is engineered to complement the existing cooling system, providing a balanced and efficient temperature management solution.

Derived from the industry-leading Front Mount Heat Exchanger technology, the CSF auxiliary radiator features a 2-row high-performance core utilizing proprietary B-Tube technology. This design incorporates ultra-efficient 6.5mm tall fins with a multi-louvered configuration to maximize surface area contact and heat transfer efficiency. The core thickness of approximately 42mm nearly doubles the capacity compared to the OEM 26mm core, enabling superior cooling performance.

⚠ Fitment Notes

Due to the increased thickness of the CSF auxiliary radiator (approximately 1 inch or 25mm thicker than the factory unit), vehicles equipped with larger wheels and tires, such as 20″ wheels on C63 models, may require trimming of the rear plastic duct or shroud by approximately 1 inch (25mm) to accommodate the radiator. This modification ensures proper fitment and airflow.

Similarly, AMG GT models may necessitate trimming or removal of the rear duct or shroud to facilitate installation.

Features

• 2-Row High-Performance Core Featuring CSF's Proprietary B-Tube Technology
• Ultra-Efficient 6.5mm Tall Fins with Multi-Louvered Design for Maximum Heat Transfer Surface Area
• Approximately Double the Cooling Capacity of OEM Units (CSF 42mm Core vs. OEM 26mm Core)
• 100% All-Aluminum Construction with Precision TIG Welding for Enhanced Durability
• CNC Machined Mounting Brackets and OEM-Style “Quick Connect” Inlet/Outlet for Seamless Installation
• Hand-Polished “Mirror Finish” Surface with a 1-Hour Finishing Process
• Includes Detachable Rock Guard for Protection Against Debris and Core Damage
• Multi-Fit Design Compatible with Both Left and Right Side Installation (For Vehicles Equipped with One or Two Auxiliary Radiators)
• Drop-In Fit Installation; May Require Minor Plastic Shroud Modification as Noted in Fitment Instructions
• Individually Leak and Pressure Tested to Ensure Quality and Reliability
• High-Performance Upgrade Suitable for Professional Racing, Street Performance, or OEM Replacement Applications
• Backed by a 2-Year Limited Warranty for Peace of Mind

Applications

Unless explicitly stated otherwise, all products sold by R44 Performance Limited are designated RACE ONLY and are solely for competition or off-road use limited to racing formally sanctioned by a recognized racing organization. Any other use, including recreational off-road use, may violate local, state, and Federal laws. R44 Performance Limited does not implicitly or explicitly confirm the legality of using any products it sells on public roads; that is entirely the responsibility of the consumer.

It is the responsibility of the customer to check with all federal, state local and environmental laws before ordering and installing a product. R44 Performance Limited is not responsible for any fees, fines or costs that a customer may incur as a result of failing to check with federal, state, local or environmental laws before ordering and installing a product.

We get a large number of custom orders and requests everyday, so as a result it is not always possible for us to keep every item in stock at all times in our warehouse. If you require the item urgently please contact our sales team here to check the stock before you make your purchase.

We totally understand if you're not certain a part will be compatible with your car, so we highly recommend contacting us here with your query. Our friendly sales team will then be in touch to confirm if this part is the correct part you are looking for.

All in stock products ship the same day if ordered before 2pm GMT

For out of stock items we will contact you with an estimated wait time if not otherwise specified above.

We offer worldwide shipping on all products. If upon receiving your product you wish to return; we offer a 30-day returns policy. For our in-depth returns information please follow the link. "R44 Returns Policy

All of our products come with a standard warranty of 1-3 years. This is dependant on the type of product however. For more details please see our warranty page here.