Yeah... I am aware that the Pentroof manifolds are actually made by companies specializing in such stuff... its Pentroof's design though. I am also aware that I could have a Pentroof manifold duplicated by such companies in Japan for less... but there's just no demand to justify doing that... based on what I am seeing now, I'll be surprised if I manage to sell more than 3-5 kits/manifolds a year. Like you said, this is not the "bread and butter" part of the business... I may even end up making a loss on the Pentroof stuff I have ordered/sold so far...