Interesting head pipes..
https://rover.ebay.com/rover/0/0/0?mpre=https%3A%2F%2Fwww.ebay.com%2Fulk%2Fitm%2F223443339383 (https://rover.ebay.com/rover/0/0/0?mpre=https%3A%2F%2Fwww.ebay.com%2Fulk%2Fitm%2F223443339383)
My guess would be "home made" i.e. shade tree mechanic, etc. ?
they actually resemble early triple dencos. :umm:
You're right Mark...they're old Dencos. I have those same pipes ( other than internal silencers) on my R5.