Koyo HH-Series 48mm Radiator for Evo 4/5/6 (Fits 7/8/9) (HH030939)




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The Koyorad HH-Series radiator features a 48mm core and polished aluminum finish. This is a direct replacement fit for the Evo 4/5/6 models. The Evo 7/8/9 models can use this radiator if you purchase an Evo 4/5/6 style upper hose. This 4/5/6 radiator places the hose more to the left of the engine bay, making room for larger manifolds.

Vehicle Fitment:
Fits Evo 7/8/9 with 4/5/6 upper hose
Fits Evo 4/5/6 (factory replacement fit)

Install Notes:
The Evo 4/5/6 Radiator fits the Evo 7/8/9 and puts the upper coolant hose in a different location, creating extra room for exhaust manifolds.

You will need the Evo 4/5/6 upper radiator hose if you are swapping it into your Evo 7/8/9.

Your factory-style lower hose will still work. The lower hose is vehicle-specific no matter which radiator you have. If you have an Evo 8, use the Evo 8 style lower hose. The radiator outlets are the same, but the water pipes are different between the models.

EVOLUTION 4/5/6, but must use Evolution 7/8/9 fan. When installing in an Evolution 7/8/9, stock fan will mount, but stock air intake system is not compatible.

This will not fit with the Factory Evo 7/8/9 airbox.

(1) Radiator
Please note, The Radiator Cap is sold separately.

More from Koyo:
Koyorad quality is a direct result of their privately owned factories which allow Koyorad Japan to oversee each stage of radiator production. This ensures that quality is never sacrificed for quantity. Each Koyo all aluminum radiator core is hand assembled, Nocolok brazed, then TIG welded by hand with the finest aluminum available. These are just a few characteristics that have earned Koyorad Radiators their excellent reputation in performance radiators worldwide.

Koyorad "HH" Series 48mm Hyper Core:
• OE Specific mounting and direct fit
• Mirror polished finish
• Nocolok-R Brazing
• Precise Tube and Fin alignment
• Billet aluminum filler neck
• 1/8" NPT female accessory fitting

See more Genuine Koyorad Parts
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Customer Reviews

Based on 4 reviews
Glenn Agapay (Hayward, CA, US)
Great radiator

Had a leak on my old mishimoto radiator, this was the next radiator I wanted to try, no regrets, it fit perfectly, shipping was fast. I had ordered some samco radiator hoses but they were shipped differently from the radiator, all and all great service. Have ordered from STM before and will continue to order from them for my evo 8 needs In the future.

Josh (Edmonton, AB, CA)
Perfect fitment into Evo 9

All around perfect and worth every penny. Stock rad fan mounted up with no modifications. Looks and performs great

Alejandro Gonzalez (San Juan, PR)

Good product!

Nick G. (Udine, 36, IT)
Satisfied with the purchase.

The good:
The customer service was pretty good and quick to reply as far as answering some of the questions I had prior to purchasing it. Shipping/ tracking was very good and arrive as scheduled. The packaging was also pretty good, there was a couple of fins that got bent not sure if that’ll affect anything except the look.
The not so good:
Kind of had me a little worried because it wasn’t exactly a direct fit per described/ answered. A pair of mounting brackets didn’t line up, not the same as the stock rad, had to modify the fan/ remove and relocate brackets on the fan to actually have it line up with each other...
Overall I’m pretty satisfied. I would purchase again from this company and will be looking for sales and discount. Thank you.

Thanks for shopping with us, Nick. We appreciate the great feedback. If you need anything at all, don't hesitate to give us a call here at the shop : )

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