All I can say about it is, looking at the kinugawa page, the only information they have is:
Front Page: How to pay us as fast as possible
About Us Page: [ENTER COMPANY INFORMATION HERE]
And given what I know about how much support you need to give a customer for turbo installs, good luck with all that.
If you would have took a trip down to Taiwan and visited Kamak's plant, You would have seen their QC and the way they manufacture it and trust me. YOU WILL BE AMAZED by their level of QC. Kinugawa, Kando all comes from the same manufacturer whom is KAMAK. Kinugawa is tested and proven to work reliability in Australia, UK and Japan. Turn it around and come to Japan and ask them about Blouch, FP and we will say, DON'T BUY THEM. because
1# they are so ****in expensive.
2# they are not well known.
The majority of Japanese Subaru's are now twinscroll. That means that, if you don't sell a twinscroll turbocharger upgrade, you won't be selling to the Japanese. So yeah, none of the big names here are known to the Japanese. And neither is Kinugawa.
Where a factory is located can be irrelevant depending on who is staffing that factory. The biggest issue with Chinese made parts isn't that people there aren't working hard on making the parts - the biggest issue is that cheap materials are often used and quality control is often non-existent. And finally, there is usually nobody there that even knows what the parts they are making are, or do, and thus they have no idea how to fix problems that crop up.
So my view is, if a bunch of engineers and QC people from Japan are actually overseeing the parts that are being made, regardless of location, the end product will be higher quality than parts being made where the only QC is by somebody that's never even seen the car the parts are going on.