Mishimoto MMRAD-CIV-06SI Perf Aluminum Radiator for 2006-11 Honda Civic Si

Vehicle Fitment

• 2006-2011 Honda Civic Si (FG1/FG2/FA1/FA5; K20Z3 2.0L I4, Manual Transmission, FWD)

Features

• Direct-fit performance aluminum radiator designed for 2006-2011 Honda Civic Si
• 100 % brazed aluminum core with TIG-welded end tanks for strength and heat transfer
• Two-row, 1.57" thick core improves cooling efficiency over stock unit
• Polished aluminum end tanks for a clean engine bay look
• Includes magnetic drain plug to capture metallic debris during maintenance
• Improves coolant temperature control under spirited driving and track use
• Factory mount compatibility - no modifications required
• Backed by Mishimoto's lifetime limited warranty

Specifications

• Material: Brazed aluminum core and end tanks
• Core Configuration: 2-row, single pass
• Core Thickness: 1.57"
• Overall Dimensions: ~18.2" L x 26.8" H x 2.07" W
• Core Dimensions: ~14.72" L x 26.32" H
• Coolant Capacity: ~2.03 gal
• Inlet/Outlet Diameter: ~1.25"
• Drain Plug Thread Size: M12 x 1.5

Included Components

• 1x Performance aluminum radiator (MMRAD-CIV-06SI)
• 1x Magnetic drain plug

Product Description

The Mishimoto MMRAD-CIV-06SI Performance Aluminum Radiator is a direct-fit cooling upgrade for the 2006-2011 Honda Civic Si powered by the K20Z3 2.0 L inline-4 engine. Built with a fully brazed aluminum core and TIG-welded end tanks, this radiator offers enhanced heat rejection and durability compared to the OEM unit. The two-row, 1.57" core increases cooling capacity and helps maintain stable operating temperatures under daily driving or spirited use on the street or track, while polished end tanks add a refined engine bay appearance.

Installation is simple and requires no cutting or modification, as the MMRAD-CIV-06SI uses factory mounting points and OEM hose connections. The included magnetic drain plug aids maintenance by capturing metallic debris during coolant changes. Backed by Mishimoto's lifetime limited warranty, this radiator is a popular performance upgrade for Civic Si owners seeking improved thermal management and reliability.