Mishimoto Aluminum Radiator | 2002-2005 Honda Civic Si MT (MMRAD-CIV-02SI)

Rating: 4.9 out of 5.0 (77)
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$302.95 $401.66Instant Savings of 25% ($98.71)

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2002-2005 Civic Si (Manual Transmission) Performance Radiator by Mishimoto

A Mishimoto performance aluminum radiator is the ideal upgrade to the stock Civic radiator. For a cooler more efficient running engine, all Mishimoto radiators are designed and engineered to maximize cooling, boost engine functions, and most importantly prevent your car from overheating.

Made with 100% brazed aluminum and polished end tanks, this lightweight dual core radiator will enhance the overall performance and lifetime of your engine. This aluminum radiator, like all Mishimoto radiators, comes with a 1.3 bar high-pressure radiator cap and is backed by our unparalleled Mishimoto Lifetime Warranty.


  • Direct fit for the 2002–2005 Honda Civic Si w/ K20 engine
  • Full aluminum construction with durable TIG-welded end tanks
  • Features a two-row, 1.42" thick brazed aluminum core which provides efficient fluid temperature regulation on the street and track
  • Includes Magnetic Drain Plug to capture any metallic debris/fragments in your cooling system


  • Greatly improves cooling efficiency
  • Prevents your car from overheating
  • Enhances the overall performance and lifetime of your engine

Please Note: This item is only for Manual Transmission vehicles.


  • 2002 - 2005 Honda Civic Si MT

What's In The Box?

  • 1 - Mishimoto Radiator
  • 1 - Mishimoto Radiator Cap
  • 1 - Magnetic Drain Plug


  • Mishimoto Limited Lifetime Warranty

Customer Reviews

Based on 77 reviews
Amazing product

Radiator really completes my 15 sti. Cools amazing never have any issues. Install was a breeze went right in. Would recommend for any one who is starting to put more horsepower in there subabru.

Hadi Jallad
Mishimoto Radiator

This was probably the easiest and best mod i put on my car. Radiator was delivered on time. Great product and it definitely exceeded my expectations. 100% a night and day difference. Fit perfectly right into the car

Won't regret purchasing

This Mishimoto radiator is a night and day difference. I can’t wait to try it out in the canyons

J Delapaz
Immediate results!

IMMEDIATELY! and i mean IMMEDIATELY after hard driving i saw temps drop back down to around 185-195. Definitely didn't see that with my stock radiators before, it used to scare me cuz it hovers around 210 for awhile before slowly dropping to around 196 (still too hot). I love how these drop temps immediately.. so i can breathe easy and not be afraid to push my car to showcase its capabilities on the roads even on a hot day. Love it!


Fits perfect and drop 10 to 20 from the stock radiator