CSF 02-07 Subaru Impreza WRX/STI All-Aluminum Radiator - w/ filler neck - Black

With over five decades of expertise in radiator manufacturing, CSF stands as a trusted leader in automotive cooling solutions. The CSF 02-07 Subaru Impreza WRX/STI All-Aluminum Radiator, finished in black and equipped with a filler neck, embodies the pinnacle of performance and reliability for your vehicle’s cooling system. Engineered to meet the rigorous demands of both street driving and competitive motorsports, this radiator is an essential upgrade for high horsepower builds and race-prepared vehicles requiring enhanced thermal management.

At the core of this radiator’s superior performance is CSF’s exclusive B-Tube Technology. Unlike conventional oval-shaped “O” tubes, CSF utilizes a uniquely engineered “B” shaped tube that is seam-brazed for exceptional strength and durability. This innovative design allows the use of thinner, lighter aluminum material without compromising structural integrity, resulting in improved cooling efficiency. The B-Tube’s construction increases the heat transfer surface area by approximately 15% compared to standard tubes, effectively delivering the cooling capacity of two smaller tubes within the same spatial constraints. This design also facilitates dual liquid laminar flow, optimizing coolant circulation for maximum heat dissipation.

Complementing the advanced core design are ultra-efficient multi-louvered fins, meticulously aligned to maximize airflow through the radiator. Each fin’s dimensions and orientation are precisely calculated and validated through rigorous wind-tunnel testing to ensure optimal heat rejection performance. The 2-row, 42mm core construction balances cooling capacity with compactness, making it ideal for the Subaru Impreza WRX and STI models without requiring modifications.

The CSF radiator is engineered as a true drop-in replacement, ensuring seamless installation with no need for alterations. All mounting brackets are CNC machined and welded to provide exceptional durability and precise fitment. Inlet and outlet connections are designed to match original equipment manufacturer (OEM) specifications, allowing the use of existing OEM hoses or compatible aftermarket components. This attention to detail guarantees compatibility with all attaching OEM parts, including quick-connect hoses, AC condensers, mounting brackets, and fan shrouds.

Key Features

• 2-Row 42mm Core (Dual Core) incorporating CSF’s exclusive B-Tube Technology for enhanced heat transfer efficiency
• Core equipped with ultra-efficient fins featuring a 6.5mm fin height and multi-louvered design to maximize surface area contact and airflow
• CNC machined quick-connect inlet and outlet connections for precise fit and ease of installation
• CNC machined brackets and fittings engineered for superior fitment and long-lasting durability
• All-aluminum race-style drain plug designed for efficient coolant drainage and maintenance
• Black finish providing a high-end, stealth aesthetic that complements the vehicle’s engine bay
• True drop-in fit requiring no modifications, compatible with all OEM components including quick-connect hoses, AC condenser, mounting brackets, and fan shroud

Applications

OEM Part Numbers

• Subaru: 45111FE000
• Subaru: 45119FE000

Warranty

Cooling Systems and Flexibles, Inc. (CSF) provides a comprehensive warranty on its High-Performance Cooling Systems, ensuring reliability and peace of mind under normal use and service conditions. This warranty applies to the original purchaser of the vehicle in which the product was initially installed. For detailed warranty information, please visit our Warranty Page.

SKU# 3076B Warranty Term: 2 years

In summary, the CSF 02-07 Subaru Impreza WRX/STI All-Aluminum Radiator represents a superior cooling solution that combines innovative engineering, high-quality materials, and precise manufacturing standards. Its advanced B-Tube core design and optimized fin structure deliver outstanding thermal performance, essential for maintaining engine efficiency and longevity under demanding conditions. The radiator’s exact fitment and durable construction make it a reliable choice for enthusiasts and professionals seeking to enhance their Subaru’s cooling system without compromising OEM compatibility or installation ease. Trust CSF’s proven expertise to provide a radiator that meets the highest standards of quality and performance for your Subaru Impreza WRX/STI.

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.

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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.