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

With over five decades of specialized expertise in radiator manufacturing, CSF stands as a leader in delivering high-performance cooling solutions tailored for the demanding needs of Subaru WRX and STI models. The CSF 08-14 Subaru WRX / STI / 15-21 Subaru WRX 2-Row 42mm Race-Spec Radiator - Black exemplifies this commitment, engineered to maintain optimal engine temperatures under both everyday driving conditions and rigorous motorsport environments.

This radiator is meticulously designed with a 2-Row core incorporating CSF’s proprietary B-Tube Technology. Unlike conventional oval-shaped “O” tubes, the “B-tube” design features a unique cross-section that is seam-brazed to enhance structural integrity. This innovative approach allows for the use of thinner and lighter aluminum material without compromising strength, resulting in superior cooling efficiency. The “B” shape increases the heat transfer surface area by approximately 15% compared to traditional tubes, effectively doubling the cooling capacity within the same spatial constraints. This design facilitates dual liquid laminar flow, optimizing coolant movement and heat dissipation.

Complementing the advanced core design, the radiator employs ultra-efficient multi-louvered fins that are precisely aligned to maximize airflow through the core. Each fin is engineered to 6.5mm in height and features a multi-louvered pattern that significantly increases the surface area contact between air and coolant, thereby enhancing heat rejection. These specifications have been rigorously tested in CSF’s wind-tunnel laboratory to ensure peak performance.

Installation is straightforward and reliable, as the CSF WRX/STI radiator is a true “drop-in fit” replacement requiring no modifications. The CNC-machined and welded OE-style mounting brackets guarantee exceptional durability and a perfect fitment. Inlet and outlet connections are designed to match OEM standards, enabling the reuse of original or aftermarket hoses without compatibility issues. This ensures a seamless integration into the vehicle’s cooling system, maintaining factory-level reliability while delivering enhanced performance.

Features

• High-Performance Core Featuring CSF’s Exclusive B-Tube Technology for Superior Heat Transfer
• Core Equipped with Ultra-Efficient 6.5mm Tall Multi-Louvered Fins to Maximize Surface Area and Airflow
• Constructed from 100% All-Aluminum with TIG-Welded Joints for Maximum Strength and Longevity
• CNC Machined Mounting Brackets for Precise Fit and Enhanced Durability
• Innovative “Multi-Fit” Combo Pipe and Plug Design Included for Versatile Installation
• True “Drop-in Fit” Design Eliminates the Need for Modifications During Installation
• Individually Leak and Pressure Tested to Ensure Reliability and Performance
• Finished in Black for a High-End, Stealth Appearance
• Compatible with Manual Transmission Models Only
• Replaces and Supersedes CSF Part #7042

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.