CSF 03-05 Honda Civic Si High-Performance All-Aluminum Radiator

With over five decades of expertise in radiator manufacturing, CSF stands as a trusted leader in automotive cooling solutions. The CSF 03-05 Honda Civic Si High-Performance All-Aluminum Radiator exemplifies this legacy, engineered to provide superior cooling performance for your Civic, whether on the street or the track. This radiator is essential for high horsepower builds and race vehicles that demand enhanced cooling efficiency in demanding motorsports environments. This radiator features a robust 2-Row, 42mm core, incorporating CSF’s exclusive B-Tube Technology. Unlike conventional oval “O” type radiator tubes, CSF employs a uniquely engineered “B”-shaped tube. These B-tubes are meticulously formed and seam-brazed to ensure a strong, airtight seal. This innovative design allows the use of thinner, lighter aluminum material without compromising strength, resulting in improved cooling efficiency compared to traditional welded “O” tubes. The B-tube design increases the heat transfer surface area by approximately 15% over standard tubes, effectively delivering the cooling capacity of two smaller tubes within the same spatial constraints. This configuration facilitates dual liquid laminar flow, optimizing heat dissipation. Complementing this technology, CSF integrates ultra-efficient multi-louvered fins that are precisely aligned to maximize airflow through the radiator core. Each fin specification is carefully calculated and validated through rigorous wind-tunnel testing to ensure maximum heat rejection efficiency. Installation is straightforward with the CSF Civic radiator’s true “Drop-in fit” design, requiring no modifications. The radiator includes CNC-machined and welded OE-style brackets for enhanced durability and precise fitment. The inlet and outlet connections are engineered to match original equipment manufacturer (OEM) specifications, allowing seamless reuse of OEM hoses or aftermarket components. This ensures a hassle-free upgrade without compromising compatibility with existing systems such as the AC condenser, mounting brackets, and fan shroud. 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 for Precise Fit and Easy Installation CNC Machined Brackets and Fittings for Superior Durability and OEM-Quality Fitment All-Aluminum Race Style Drain Plug for Enhanced Durability and Maintenance Convenience 1-Hour “Mirror Finish” Hand Polish for Corrosion Resistance and Aesthetic Excellence “Drop-in Fit” Requiring No Modifications to Install – Compatible with All OEM Attaching Components Including “Quick Connect” Hoses, AC Condenser, Mounting Brackets, and Fan Shroud Applications Year Range Make Chassis Code Model Trim Engine / Trans / Etc Notes 2002-2005 Honda EP3 Civic Si 2L L4 (Manual) – OEM Part Numbers Honda: 19010 PRA 003 Honda: 19010-PRA-003 Honda: 19010PRA003 Honda: 19010 PNF 003 Honda: 19010-PNF-003 Honda: 19010PNF003 Warranty Cooling Systems and Flexibles, Inc. (CSF) guarantees its High-Performance Cooling Systems under normal use and service to the original purchaser of the vehicle in which the product was initially installed. This warranty reflects CSF’s commitment to quality, reliability, and customer satisfaction. For comprehensive warranty details, please visit our Warranty Page. SKU# 3022 Warranty Term: 2 years In summary, the CSF 03-05 Honda Civic Si High-Performance All-Aluminum Radiator delivers exceptional cooling performance through advanced engineering and premium materials. Its precise fitment, durable construction, and innovative B-Tube Technology make it the optimal choice for enthusiasts and professionals seeking reliable temperature management for their Civic Si. Trust CSF to maintain your engine’s optimal operating temperature, ensuring longevity and consistent performance under all driving conditions.