REBAND made both sets of pipes. The original pipes made for Anthony were the basis for the REBAND pipes now. They are 1 5/8" ID headers with a proper merge collector. The second set were 1 3/4" id headers but otherwise the same , apart from appearance. The original REBAND pipes ( same as sold now) limited the over 240hp rear wheel engine. I had input to the specifications, but not the fabrication of both sets.
CES exhausts are almost identical in header dimension, but the secondary pipes are smaller. Both pipes have tuned length headers or very close.
Carpenter "Brute" (I think is the name) pipes have the 2" OD headers not tuned length, it is worth noting that the port piece made of alloy which bolts to the head is only 1 3/4" ID anyway. The secondary pipe is pretty much the same size as the CES, but much shorter. Open megga muffler.
Muzz made pipes . only a few, ten years ago , or maybe more. The technical design was my design, the fabrication and appearance was his. The port pieces were made by CNC machine to my spec by a friend of mine.
Paul Bryant can speak for himself , I have not seen or measured his, but the pics look lovely, and he is obviously a good fabricator.
I have not yet seen or measured Carpenters swirly headers pipe. or OZ Riders exhaust.
I have NO financial interest in any of these folks or exhausts, but am merely stating what I have found or measured, in an effort to assist.