CSF 08-14 Subaru WRX / STI / 15-21 Subaru WRX 2-Row 42mm Race-Spec Radiator

With over five decades of dedicated expertise in radiator manufacturing, CSF stands as a benchmark in automotive cooling solutions. The CSF 08-14 Subaru WRX / STI / 15-21 Subaru WRX 2-Row 42mm Race-Spec Radiator exemplifies this legacy, delivering unparalleled cooling performance tailored specifically for Subaru WRX and STI models. Whether your vehicle is a high-horsepower street build or a competitive race car, this radiator ensures optimal engine temperature management under demanding conditions.

Engineered to excel both on the street and at the track, this radiator incorporates CSF's proprietary B-Tube Technology. Unlike conventional oval-shaped "O" tubes, CSF’s innovative "B" shaped tubes enhance structural integrity and thermal efficiency. These tubes are meticulously formed and brazed over the seam, enabling the use of thinner, lighter aluminum material without compromising strength. This design increases the heat transfer surface area by approximately 15% compared to standard tubes, effectively doubling the cooling efficiency within the same spatial constraints.

The unique "B-tube" configuration facilitates dual liquid laminar flow, optimizing coolant circulation for superior heat dissipation. Complementing this is the radiator’s core, featuring ultra-efficient 6.5mm tall multi-louvered fins. These fins are precisely aligned to maximize airflow through the core, enhancing heat rejection capabilities. Each fin specification is carefully calculated and rigorously tested in CSF’s wind-tunnel laboratory to guarantee peak thermal performance.

Installation is straightforward with the CSF WRX/STI radiator’s true "drop-in fit" design, requiring no modifications. The radiator includes CNC machined and welded OE-style mounting brackets, ensuring durability and precise fitment. Inlet and outlet connections are engineered to match original equipment specifications, allowing seamless integration with OEM or aftermarket hoses. This attention to detail underscores CSF’s commitment to quality, reliability, and ease of installation.

Key Features

• High-performance 2-row core utilizing CSF’s exclusive B-Tube Technology for enhanced strength and cooling efficiency
• Ultra-efficient 6.5mm tall multi-louvered fins designed for maximum surface area contact and airflow
• 100% all-aluminum TIG-welded construction, ensuring durability and corrosion resistance
• CNC machined mounting brackets for precise fit and long-lasting strength
• Innovative "Multi-Fit" combo pipe and plug design included for versatile installation options
• True "drop-in fit" requiring no modifications, preserving vehicle integrity
• Individually leak and pressure tested to guarantee reliability and performance
• Hand-polished with a 1-hour "mirror finish" for superior aesthetics and corrosion protection
• Designed exclusively for manual transmission applications
• Supersedes CSF part number #7042, offering improved performance and fitment

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.