HERE IS WHAT I WOULD CONSIDER FOR YOUR SUCCESSFUL APPEAL TO YAMIYA TO PRODUCE THESE LOTUS ROOT EXHAUST:
1. Yamiya started talking around 2003 there would be Lotus Root exhaust produced. (btw, the exhaust are called 'lotus root' because the diffuser resembles the root of the lotus plant.)
2. At the time, i was passionately attempting to make contact with different Japanese people of industry to learn more of the history of the sandcast. What I turned up was Japanese producing parts out of private shops that spoke little to no English (e.g., Nishimatsu, Yamiya.)
3. Yamiya was not even sure if or how many lotus roots they would produce. Yamiya asked me to ask SOOC members if they were interested, so i sent out email to everyone i knew. At least 20 SOOC members were on "the list" to Yamiya.
4. It took from 2003 until 2006 for Yamiya to produce the lotus roots. I know for a fact, Yamiya was reluctant to produce the lotus roots because they feared the diffuser would easily come out during operation and injure or damage persons/property. The exhaust were shipped with a disclaimer relieving Yamiya of any liabiity. For those who have seen a diffuser from the lotus root muffler, they are heavy and (big.) IF the 6mm hex screw did loosen and fall out, then allowing the diffuser to fall out, it COULD potentially cause harm/damage.
5. Yamiya ultimately made 50 sets of lotus roots. When they received the lotus roots, Katsuya Oe, told me there would be no more. The 50 sets were a one time production run. I really tried to impress this on member's brains, this could possibly be an opportunity of a lifetime, to own a new set of lotus roots.
6. Now, i have NO WAY of knowing IF Yamiya could be persuaded to make more. MAYBE, if you guys who wanted to purchase sets got a list of of names and money together and told Yamiya, for example, "We have 25 people here who will send a deposit of $25,000 for you to produce the lotus root again."
7. There is another possible problem with Yamiya producing the lotus root exhaust. Story has it, while Honda was having manufactured the "paragraph" HM300 exhaust, the muffler halves (unstamped blanks) were somehow liberated from the manufacturing plant, into the hands of someone else who then made the unstamped muffler halves into the early lotus roots. I have heard, but i do not know for fact, Honda is no longer having produced the "paragraph" HM300 exhaust. IF this is true and IF the source for Yamiya was this manufacturer of "paragraph" exhaust, then there are no parts to make the lotus roots. Hence, the possibility of having the parts to make lotus roots is possibly "zero." (Katsuya Oe told me the manufacture of the lotus root diffuser was more difficult than the actual exhaust. It goes without saying, the manufacture of these exhaust, required time, effort, money and skill. Not a part that could be produced with a chisel and a hammer.)
8. I'm giving you these thoughts, because if you guys are REALLY SERIOUS about appealing to Yamiya to produce more lotus roots, it will take some organization and representation to show Yamiya you're willing to put your money where your mouth is.
THE FIRST THING I WOULD SUGGEST: Contact Yamiya and ask: 1. Does Yamiya still have the parts source to produce lotus root?
2. If Yamiya had a serious $$ deposit, would they be able to produce Lotus Roots complete with diffusers again?
It's sad, there is interesting information, written at some length, about the origin source of these new manufacture lotus roots on another website. Would be nice if the author(s) of this information could bring themselves to share it on this BB, dedicated to the sandcast. If one knew more about the principals behind the manufacture of these exhaust, it might be possible more exhaust could be produced. (As an aside, there is also interesting information about the blue-green pre-production bike on that website, that, for what ever the reason, the author chose to not share on SOOC.)
Good luck !