CSF 08-14 Subaru WRX / STI / 15-21 Subaru WRX 1-Row 31mm High-Performance Radiator

With over five decades of specialized experience in radiator manufacturing, CSF stands as a leader in delivering high-quality cooling solutions tailored for performance vehicles. The CSF 08-14 Subaru WRX / STI / 15-21 Subaru WRX 1-Row 31mm High-Performance Radiator embodies this expertise, designed to maintain optimal engine temperatures under demanding conditions. Whether navigating daily street driving or pushing limits on the racetrack, this radiator ensures your Subaru WRX or STI operates at peak efficiency, safeguarding engine performance and longevity.

Engineered specifically for high horsepower applications and motorsport environments, this radiator integrates advanced features that elevate cooling capacity beyond standard OEM components. Central to its design is CSF’s exclusive B-Tube Technology, a significant innovation in radiator tube construction. Unlike traditional oval-shaped “O” type tubes, CSF’s B-Tubes are meticulously engineered into a “B” shape, which enhances structural integrity and thermal transfer capabilities. The tubes are seam-brazed to ensure a robust seal, allowing the use of thinner and lighter aluminum material without compromising durability.

This design increases the heat transfer surface area by approximately 15% compared to conventional tubes, effectively delivering the cooling efficiency equivalent to two smaller tubes within the same spatial constraints. The B-Tube configuration also facilitates dual liquid laminar flow, optimizing coolant movement and heat dissipation throughout the radiator core. Complementing this technology are ultra-efficient multi-louvered fins, precisely aligned to maximize airflow and thermal rejection. Each fin’s dimensions and louver angles are carefully calculated and validated through rigorous wind-tunnel testing, ensuring superior heat exchange performance tailored to the Subaru WRX/STI platform.

The CSF radiator is engineered as a true “drop-in fit” replacement, requiring no modifications for installation. This seamless integration preserves the vehicle’s original assembly standards and simplifies the upgrade process. The mounting brackets are CNC machined and welded to exacting tolerances, providing enhanced durability and secure fitment. Additionally, the inlet and outlet connections are designed to match OEM specifications, allowing the use of original Subaru hoses or compatible aftermarket alternatives without adaptation.

Features

• High-Performance Core Featuring CSF's Exclusive B-Tube Technology for Enhanced Cooling Efficiency
• 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 Superior Strength and Corrosion Resistance
• CNC Machined Mounting Brackets for Precise Fitment and Long-Term Reliability
• Innovative Multi-Fit Combo Pipe and Plug Design Included for Versatile Installation Options
• True Drop-In Fitment, Eliminating the Need for Modifications During Installation
• Individually Leak and Pressure Tested to Ensure Quality and Performance Standards
• Finished with a One-Hour “Mirror Finish” Hand Polish for Enhanced Aesthetic and Corrosion Protection
• Designed Exclusively for Manual Transmission Applications
• Supersedes CSF Part Number #7028, Incorporating Latest Design Improvements

This radiator is specifically engineered to meet the rigorous demands of Subaru WRX and STI models from 2008 through 2014, as well as the 2015 through 2021 WRX models. Its design supports turbocharged and naturally aspirated H4 engines equipped with manual transmissions, ensuring compatibility and optimal cooling performance across a wide range of Subaru vehicles.

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.