Mishimoto MMRAD-CTR-23 Performance Aluminum Radiator for 2023-2026 Honda Civic

Vehicle Fitment

• 2023-2026 Honda Civic Type R (FL5, K20C1 2.0L Turbo I4, FWD, Manual Transmission)

Fitment Notes

• Fits all 2023+ Honda Civic Type R (FL5) models equipped with the K20C1 2.0L turbocharged engine.
• Plug-and-play installation - bumper removal is not required for this radiator swap.
• Fully compatible with stock Honda coolant hoses - no hose replacement needed unless upgrading to the Mishimoto silicone hose kit (MMHOSE-CTR-23).
• Foam seal to the fan shroud is included to optimize airflow through the core.
• Does not fit the FK8 (2017-2021) or FK2 (2015-2016) Civic Type R - those use MMRAD-CTR-17.

Features

• 17% increase in heat rejection over the OEM radiator, delivering an average 5-10°F drop in coolant outlet temperatures - a measured result that keeps Type R temps stable through back-to-back track sessions.
• 49% greater core volume and 31% larger external fin area and internal tube area than the stock radiator - maximizing heat dissipation within the FL5's existing packaging constraints.
• 40mm strutted tube single-row core resists chassis flex during high-speed cornering, spirited driving, and repeated track use.
• All-aluminum construction with precision TIG-welded end tanks eliminates the weak points inherent to the factory plastic end tank design.
• Plug-and-play fitment - no bumper removal required, installs directly in the OEM location using stock hoses and mounting points.
• Included foam seal ensures a tight, airtight seal to the factory fan shroud for optimal airflow through the core.
• Magnetic Drain Plug included - captures metallic debris from the cooling circuit to protect the engine and improve long-term system integrity.
• Backed by Mishimoto's Lifetime Warranty.

Specifications

• Fitment: 2023-2026 Honda Civic Type R (FL5), K20C1 2.0L Turbo I4, FWD
• Core Type: Strutted Tube, Single-Row
• Core Thickness: 40mm (1.57 in.)
• Core Volume Increase vs. Stock: 49%
• External Fin Area Increase vs. Stock: 31%
• Internal Tube Area Increase vs. Stock: 31%
• Heat Rejection Increase vs. Stock: 17%
• Average Outlet Temperature Drop: 5-10°F
• Construction: TIG-Welded Aluminum End Tanks
• Fan Shroud Seal: Foam Seal (Included)
• Hose Compatibility: OEM Stock Hoses (No Replacement Required)
• Bumper Removal Required: No

Included Components

• 1x Mishimoto Performance Aluminum Radiator
• 1x Foam Fan Shroud Seal
• 1x Magnetic Drain Plug
• 1x Mishimoto Lifetime Warranty

Product Description

The Mishimoto MMRAD-CTR-23 is a direct-fit performance aluminum radiator engineered specifically for the 2023-2026 Honda Civic Type R (FL5) powered by the K20C1 2.0L turbocharged inline-four. The FL5 Type R is one of the most capable front-wheel-drive performance cars on the market, but the factory cooling system - like most OEM setups - is built for production efficiency rather than the repeated thermal stress of back-to-back track sessions, autocross days, or aggressive street driving in warm conditions. The MMRAD-CTR-23 addresses the gap with a 17% improvement in heat rejection and an average 5-10°F reduction in coolant outlet temperatures, measured under real-world conditions and verified to remain consistent across repeated hard laps.

The 40mm strutted tube single-row core carries 49% more core volume than the stock unit - making full use of the available packaging space in the FL5 engine bay. A 31% larger external fin area and 31% greater internal tube area work together to maximize heat transfer surface, while the strutted tube construction resists the kind of core deformation that can occur under chassis flex during aggressive driving. TIG-welded aluminum end tanks replace the factory plastic units that crack and weaken under repeated heat cycles. Critically, this radiator installs plug-and-play without bumper removal - a common obstacle with performance radiator swaps on modern front-wheel-drive platforms - and is fully compatible with the factory coolant hoses, making the upgrade as straightforward as a standard radiator replacement. An included foam seal ensures the radiator seats flush against the fan shroud to prevent hot air recirculation.

The MMRAD-CTR-23 is designed to pair with other Mishimoto FL5 CTR cooling components including the silicone radiator hose kit (MMHOSE-CTR-23) and the aluminum expansion tank for a complete cooling system build. A Magnetic Drain Plug is included to capture metallic debris from the coolant circuit. Backed by Mishimoto's Lifetime Warranty.