These look like very well made parts. I would not say they are copies of either Ash or Tom's parts. The bends are slightly different and it has additional feature to make it Pnp. I like the fact that its Aluminum and its a finished product. No offense to other vendors but a lot of the other pipes and IC's look like prototype fabrication and not finished production pcs
Yes its expensive and yes its a copy of the "concept" of 2.5 inch pipes and yes they are most likely AMS will copy these :(