Cooling for 2003 Honda Civic

Includes a FREE Mishimoto high pressure radiator cap (on most applications) and a magnetic drain plug! All Mishimoto radiators are designed to be used...

IMPORTANT: Unless you have very specific needs, we highly recommend getting both the Oil Filter Take-Off and Oil Filter Pedestal. They are designed to...

Benefits Helps control oil temperatures, which is crucial for race and high-performance applications. Perfect for customers who are building their...

Eliminating excess heat is something that all performance cars deal with. One way to do this is to use a Mishimoto's Racing Thermostat. They open at a...

All Koyo radiators are for MANUAL TRANSMISSION vehicles ONLY, unless noted otherwise. Some applications may fit on automatic transmission equipped ca...

Used by everyone from professional racing teams to NASA, gold heat reflective tape is not only a stunning addition to your engine bay, but is also ama...

Water / methanol injection is designed to allow higher boost and more advanced timing on forced induction 2003 Honda Civics, to get significantly more...

This new version has a lower price and now works with almost any Japanese vehicle! A GReddy Radiator Breather Tank will help keep your 2003 Honda C...

This is the recommended radiator cap for use directly on any Koyo radiator, but can also work on factory radiators as well. The Koyo Hyper Radiator...

Includes a FREE Megan Racing high-pressure 1.1-1.3 bar radiator cap (on most applications)! All Megan radiators are designed to be used only on MANUAL...

An old plastic coolant reservoir or expansion tank will eventually wear out and crack. These premium Mishimoto coolant reservoir overflow and expansio...

For best and easiest install, an Electric Fan Mounting Kit is recommended. Mishimoto High Performance Electric Slim Fans are great for use on custo...