bedouin -
i wouldn't hold my breath on that one. it's true the pipes were originally designed for the 790 & the 28hp was backed up by their dyno runs back then with NO other fuel/air mods. if you recall ( you had just joined) there was that period of time we all heard of a bigger ( possibly 1100) bonny/speedmaster that turned out to be the 865 speedy. i corresponded with those guys then & thats near to 2 years ago that they told me the same thing about developing pipes tuned to the 865 motor!!
from 3 years of pipe discussion it seems sound & quality ought to be the #1 concern with the more expensive pipes being the ones that respond better to other performance mods. near to everyone has agreed cheap sounds cheap & is deafening to boot.
