CSF Radiator | 22+ Civic 1.5T Si, 23+ Integra A-Spec

Fits:

• 2022+ Honda Civic Si (Sedan FE1)
• 2023+ Acura Integra Base/A-Spec (Hatch DE4)

True plug-and-play drop-in fit, no modifications required. Individually leak and pressure tested. 2-year limited warranty.

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CSF builds the factory HPD race radiators for Honda's Civic Type R TCR program, and this High-Performance radiator for the FE1 Si and DE4 Integra is developed from that same racing know-how. The factory radiator is a solid, durable design, but it's a single-row plastic-tank unit not built with high-horsepower builds or hard track driving in mind — and turbo engines generate real heat that needs somewhere to go.

CSF's version steps up to a 2-row, 42mm all-aluminum core (vs. 28mm single-row OEM) using their exclusive B-Tube technology for roughly 15% better heat transfer than standard oval welded tubes. New 5mm multi-louvered fins increase the heat exchange surface area 20-25% over larger fin designs, and everything is 100% TIG welded rather than crimped like the factory plastic-tank unit. In testing on the closely related FL5 CTR radiator (same core), CSF measured an 8°C reduction in engine coolant temperature versus OEM on a 294whp tuned car running a larger front-mount intercooler — exactly the kind of setup where a bigger intercooler's added airflow restriction over the radiator makes cooling capacity matter most.

Features

• 2-row, 42mm all-aluminum core vs. 28mm single-row OEM
• CSF Exclusive B-Tube Technology, ~15% better heat transfer than oval tubes
• 5mm multi-louvered fins, 20-25% more heat exchange surface area
• 100% TIG-welded aluminum construction (vs. crimped plastic tank OEM)
• 8°C lower coolant temps vs. OEM in testing on a tuned, intercooled FL5 (same core)
• CNC-machined mounting brackets, OEM-style inlet/outlet, drop-in fit
• 1.4 bar high-pressure cap included, 1-hour mirror-finish hand polish
• 2-year limited warranty