You will also notice that most of those pieces are only welded in one plane. Take a look at the koni or H&R struts and you will see that they usually use a C type of bend, this way you have welds on two different planes.. I'm not a mechanical engineer but I do understand a little bit about shearing forces.. I would love for somebody to post those things in the track forum on bimmerforums and ask some of the race engineers there what they think about the welds and how well those things will stand up to some serious abuse...
http://www.tcklineracing.com/TCKE36SD-small.jpg You can see what I mean in that picture. They take a piece of metal and bend it on both ends to the end up with what looks like a C, then weld that all the way around. Everything that is welded on my strut bodies is welded in two planes. The sway bar tab, the bottom kingpin bolts area, as well as the "camber" adjustment bolt hole.
Also notice how high up the provision is for the strut mounted sway bar, how are they going to do that with threading all the way down the body?
It looks to me like they are trying to copy k-sport coilovers, but got some parts of the copy wrong...
http://www.erzperformance.com/v/vspf...NTROL-01-2.jpg Notice they have similar little pin adjusters.