if i did not say it already, the fit of Yamiya "no.no" exhaust leaves as much or even more to be desired as oem HM300's. i just fitted a set of Yamiya "no.no" to a K1, the connecting pipes at rear of exhaust do not align well at all. oem or repro, "alignment" varies from set to set. this last set of Yamiya's, the connecting pipes were off by half the diameter of the connecting pipe. "no.no's a really wrong part for the K1 application, but considering what prices are being demanded for oem HM's v.s. repro "no.no's," my going with "no.no's" is a no brainer for me.
as for getting the best possible alignment of these pipes, i have found leaving the exhaust loose at the spigots, tightening the passenger pillion bolts first, then the spigot bolts helps somewhat.