@Rob Quilter may have an idea about this?
If you want my guess..they are not genuine parts; coming from China. But, they may well perform just as good as the real article.
The Air Filter looks identical in every way to the genuine product, and is probably manufactured using the same process. Just in China rather than Japan (even if the box says 'Made in Japan').
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The Turbo Timer appears identical other than
possibly a slightly different colour LED display.
And the BOV appears to be the same
except it has a black finish. And the genuine article appears to come with only 'Silver Coated Aluminium Die-Cast Body'.
http://www.hks-power.co.jp/en/product/blow_off/sqv/
This reminds me of the Skunk2 Gearknobs. Several colour options on eBay & they all look very well made, but knockoffs nonetheless. On the Skunk2 website they only offer the gearknob in titanium coated finish.
The tuning market is of course flooded with fake products..because they are so affordable, and quite often identical to look at.
Overall, I would guess that these items are not genuine, but will probably do what they are supposed to do. Because they are most likely manufactured in exactly the same way, just in a different place, and perhaps illegitimately.
I'd definitely get the Air Filter, because it looks identical & is a very basic product. Regarding the other two, depends on whether you want to get guaranteed genuine parts, or whether price is more important. Because to the trained eye, you might get caught out. Not that that necessarily matters.
I would expect all 3 to do their job in a satisfactory manner though.
