I believe there are 2 types of system needed.
1. A free flowing header that hooks up to stock pipes - which also means TORS, Staintunes and all the other pipes that many of us already have, andmaybe want to keep
2. a full system with 3 into 1 or whatever configuration is desired.
I'm very keen on the first option. I have a set of Dennis Foran pipes that connect to the stock header just rear of the O2 sensor and I'd like to keep them. Something like this is what I'm after - and is the design that TC had been investigating. This set is on Gothlander's bike and were made by Sam (travelguy) who sadly has said he won't make any more. He also made the headers that Hanso and Evil Mitch have. I have no idea how that compare to Reband or Carpenter performance wise, but I do know they'd be well and truly good enough and besides, it's the look I want. If these can be made and be able to connect to my Foran pipes for around a grand I'd snap them up.