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Cobb Tuning Products B22410-RS: Radiator CSF Aluminum Polished Downflow 2 Row Subaru WRX STI Each – COBB Tuning offers CSF aluminum radiators that pack great technology into their compact 2-row designs. Providing better cooling capacity without the added weight these radiators feature more efficient B-tubes with greater surface area for cooling 15 percent increase in fin technology alone and a precision multi-louvered fin to increase heat rejection performance and surface area contact. CSF radiators also look great with their mirror-polished finish. For cooling performance and style upgrades over OE units choose CSF aluminum radiators from COBB Tuning. They’re offered individually or in cooling kits with silicone radiator hoses and COBB logo coolant reservoir cap.