David, I am running the Picco 80 with an old header (really short) that I got with the engine. I use a second aluminum tube to lengthen the header, which the couples to a Novarossi pipe. The .80 is a beast, but just yesterday it broke its bearings for the third time. It might have some design issues. I am waiting for new bearings as well as for a Jett .90 BSE that Dub is repairing for me, to put on the Arrow.

Regarding your Arrow-like designs, could you send me a sketch? I was about ready to get an arrow kit from Rcaiir, but will wait for your response (intrigued).

Thanks for this very interesting thread

Ed