CSF BMW E46 3-Series / 03-05 E85/E86 Z4 High-Performance All-Aluminum Radiator

CSF brings over fifty years of expertise in radiator manufacturing, establishing itself as a leader in high-performance cooling solutions. The CSF BMW E46 3-Series / 03-05 E85/E86 Z4 High-Performance All-Aluminum Radiator is engineered to meet the demanding cooling requirements of both street-driven and motorsport vehicles. This radiator is an essential upgrade for enthusiasts seeking enhanced thermal management, especially in high horsepower applications or competitive racing environments.

At the core of this radiator lies CSF's proprietary 2-Row core design featuring exclusive B-Tube Technology. Unlike conventional oval-shaped “O” tubes, the innovative “B” shaped tubes are precision-formed and seam-brazed, resulting in a structure that is not only lighter but also stronger than traditional welded tubes. This advanced design allows the use of thinner aluminum material, which significantly improves heat dissipation efficiency. The unique inlet placement in the middle of the tube increases the heat transfer surface area by approximately 15%, effectively doubling the cooling capacity of tubes within the same spatial constraints. This dual liquid laminar flow optimizes coolant movement and heat rejection, ensuring superior engine temperature control under all operating conditions.

Complementing the B-Tube core, the radiator incorporates ultra-efficient multi-louvered fins with a 6.5mm fin height. These fins are meticulously aligned and engineered to maximize airflow through the core, enhancing heat exchange performance. Each fin specification is carefully calculated and validated through rigorous wind-tunnel testing at CSF’s advanced laboratory, guaranteeing optimal cooling efficiency tailored to the specific demands of the BMW E46 3-Series and Z4 chassis.

Designed as a true “drop-in fit” replacement, this radiator requires no modifications for installation, preserving the integrity and functionality of the original vehicle setup. The OE-style brackets are CNC machined and welded to ensure exceptional durability and precise fitment. Inlet and outlet connections are engineered to match OEM specifications, allowing seamless integration with existing hoses and aftermarket components. This compatibility extends to all attaching OEM parts, including quick-connect hoses, AC condensers, mounting brackets, and fan shrouds, facilitating a straightforward installation process.

Features

• 2-Row 42mm Core (Dual Core) Featuring CSF's Exclusive B-Tube Technology for Enhanced Strength and Cooling Efficiency
• Core Equipped with Ultra-Efficient Multi-Louvered Fins, 6.5mm Fin Height, Maximizing Surface Area for Superior Heat Dissipation
• CNC Machined Quick-Connect Inlet and Outlet Connections for Precise Fit and Reliable Seal
• CNC Machined Brackets and Fittings Delivering Robust Durability and Accurate Alignment
• All-Aluminum Race Style Drain Plug, Ensuring Easy Maintenance and Longevity
• Smooth Satin Finish Providing Corrosion Resistance and Professional Appearance
• “Drop-in Fit” Design Requiring No Modifications, Compatible with All OEM Components Including Quick Connect Hoses, AC Condenser, Mounting Brackets, and Fan Shroud

This radiator is engineered to meet the rigorous demands of the following BMW models and configurations, ensuring optimal performance and reliability:

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.