I don't wish ill upon Mike's XS as a supplier or anyone purchasing these but there is a reason these "look exactly like" the Racetech ones. These are blatant rip-off copies from China. I know it can be difficult to do, but I try to not support such activities with my $$$. Our manufacturing base has been eroding for a very long time and having innovative products that are well made be so massively undercut by copies made elsewhere is discouraging to say the least. The fact that we embrace these copies because they are so much cheaper than the originals is another nail(admittedly amongst many others) in our own industrial coffin.
Also, there is the possibility that these cheap copies don't perform as well as the Racetech ones do. Will it meet and maintain the same level of performance as the Racetech product? I don't know.
Ken
No affiliation with Racetech.