Koyo KH082661 Aluminum Radiator for 2012-2015 Honda Civic Si 2.4L

Vehicle Fitment

• 2012-2015 Honda Civic Si Coupe (FG4, 2.4L K24Z7 I4, FWD, 6-Speed Manual)
• 2012-2015 Honda Civic Si Sedan (FB6, 2.4L K24Z7 I4, FWD, 6-Speed Manual)

Fitment Notes

• Fits Si trim models only.
• Manual transmission applications only.
• Not compatible with OEM radiator cap.
• Requires Koyorad SK-C13 radiator cap or equivalent high-pressure cap.
• Retains OEM fan shroud and factory hose compatibility.
• Does not fit non-Si Civic models.

Features

• All-aluminum high-performance radiator construction
• Koyorad KH-Series Hyper Core technology
• High-density louvered cooling fins for improved heat transfer
• Direct bolt-in OEM-style fitment
• Precision TIG-welded end tanks
• Increased coolant capacity versus factory radiator
• Compatible with factory fan shroud and OEM hoses
• Nocolok brazed aluminum core construction
• Triple pressure-tested for durability and leak prevention
• Designed for street and circuit-use cooling performance

Specifications

• Part Number: KH082661
• Radiator Series: KH Hyper Core Series
• Core Thickness: 25mm
• Core Material: Aluminum
• Tank Material: Aluminum
• Engine Compatibility: 2.4L K24Z7 I4
• Transmission Compatibility: 6-Speed Manual
• Vehicle Chassis: FB6 / FG4
• Drivetrain: FWD
• Position: Front Engine Cooling System

Included Components

• 1x Koyorad KH-Series Aluminum Radiator

Product Description

The Koyo KH082661 aluminum radiator is a direct-fit high-performance cooling upgrade engineered specifically for the 2012-2015 Honda Civic Si equipped with the 2.4L K24Z7 engine and 6-speed manual transmission. Utilizing Koyorad's proven KH-Series Hyper Core design, this radiator delivers increased cooling efficiency and coolant capacity while maintaining OEM-style installation compatibility for both street and track-driven vehicles.

Constructed with fully aluminum TIG-welded end tanks and a high-density louvered fin core, the KH082661 improves heat dissipation under aggressive driving conditions without requiring chassis modifications. Koyorad designed this radiator to retain factory fan shrouds, OEM hose routing, and stock mounting locations, making installation straightforward while significantly improving durability compared to the factory plastic tank radiator.

Ideal for naturally aspirated performance builds, autocross cars, and track-day applications, the KH082661 helps maintain stable coolant temperatures during sustained high-RPM operation. Because this radiator uses a specialized filler neck design, the factory radiator cap is not compatible, and a Koyorad SK-C13 or equivalent radiator cap must be used for proper operation and pressure retention.