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

With over five decades of expertise in radiator manufacturing, CSF stands as a trusted leader in delivering high-quality cooling solutions. The CSF 02-07 Subaru Impreza WRX/STI All-Aluminum Radiator with filler neck exemplifies this legacy, engineered to provide superior cooling performance essential for both street driving and competitive motorsports. This radiator is meticulously designed to meet the rigorous demands of high horsepower applications and race environments where enhanced thermal management is critical to maintaining engine reliability and performance.

At the core of this radiator is CSF’s exclusive B-Tube Technology, a significant advancement over traditional oval “O” shaped tubes. These innovative “B-shaped” tubes are precision-formed and seam-brazed, allowing the use of thinner, lighter aluminum that offers improved cooling efficiency without compromising structural integrity. The unique design increases the heat transfer surface area by approximately 15% compared to conventional tubes, effectively delivering the cooling capacity of two smaller tubes within the same spatial constraints. This results in a dual liquid laminar flow, optimizing coolant movement and heat dissipation throughout the radiator.

Complementing the B-Tube design, the radiator incorporates ultra-efficient multi-louvered fins with a 6.5mm fin height. These fins are precisely aligned and engineered to maximize airflow through the core, enhancing heat rejection capabilities. Each fin specification is rigorously calculated and validated through wind-tunnel testing to ensure maximum thermal efficiency under varying operational conditions.

The CSF WRX/STI radiator is engineered as a true “Drop-in fit” component, requiring no modifications for installation. This ensures seamless integration with OEM components, including quick-connect hoses, AC condenser, mounting brackets, and fan shroud. The inlet and outlet connections are CNC machined to match original equipment specifications, enabling the reuse of factory or aftermarket hoses without adaptation. Additionally, the radiator features CNC machined brackets and fittings, providing exceptional durability and precise fitment that meets stringent automotive standards.

Further enhancing its race-ready design, the radiator includes an all-aluminum race-style drain plug and undergoes a meticulous 1-hour “mirror finish” hand polish, reflecting CSF’s commitment to quality and attention to detail. This combination of advanced materials and manufacturing processes ensures a robust, reliable cooling system capable of withstanding the demands of both daily driving and competitive racing.

Features

• 2-Row 42mm Core (Dual Core) Featuring CSF's Exclusive B-Tube Technology
• Core Features an Ultra-Efficient Fin with 6.5mm Fin Height and Multi-Louvered Design for Maximum Surface Area Contact
• CNC Machined "Quick-Connect" Inlet/Outlet Connections
• CNC Machined Brackets and Fittings for Superb Fit and Durability
• All-Aluminum Race Style Drain Plug
• 1-Hour "Mirror Finish" Hand Polish
• "Drop-in Fit" Requiring No Modifications to Install - Accepts All Attaching 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) guarantees the performance and reliability of its High-Performance Cooling Systems under normal use and service conditions. This warranty is extended to the original purchaser of the vehicle in which the product was initially installed. For comprehensive warranty details and conditions, please refer to our Warranty Page.

SKU# 3076 Warranty Term: 2 years

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.