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

I have always admired both Japanese as well as German manufacturing for it's inherent quality and attention to detail. That's probably why I was surprised and a little disappointed by two issues with the Koyo Radiator I purchased. Being a welder by trade and typically only a welder would see this, The beads had cold stops meaning the center of the bead cratered in and had the potential for a pin hole. almost every weld I looked at had a cold stop, yet it holds water and pressure, so not an issue. The second and sadly more obvious was even though it was very well packaged and there was no damage to the box it was shipped in, my radiator showed up with one row of fins caved in. It had been damaged, packaged and shipped. Since this is the far outer row, I don't consider it a problem as far as function. It's just disappointing to purchase something you think is going to be a nice good quality part and have it look like it's beat up before it even goes in the car. Anyway, enough with my griping. On track this radiator performs. I never had my temperature move the slightest above what the thermostat was holding. only at sustained high speed high RPM's did the temps start to creep up and they would immediately drop if I got out of it. I believe this to be more related to aero ducting than the heat exchanger, so overall, I still feel better than as if would have buying some cheap Chinese unit.

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.

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

Good product!

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.