They will fit without modification. The sound will not change.
They are listed in the Hondaline accessory catalog as fitting all three Valkyries without mods.
Brad
Then they made a misprint. You'd have to cut the piggies to use them on an Interstate, and inside
of the giant triple tips, there'd be droning.
There's a way to use the triple tips and get the most quietness. Cut the piggies back to
where the difference between STD/Tourer and Interstate piggies starts. Replace the piggies
with your own little pipes that are straight. Your new piggies will line up with the "exhaust holes"
on the triple tips now. Cut your new piggies long enough to come all the way to the end
of the triple tips, or extend beyond if you think it looks good. Eliminating the "echo chamber"
and shooting the exhaust noise out into the great outdoors is about as quiet as you can
get on a Valkyrie.
I let my triple tips get rusty on the bottom. I think you should treat the bottom of your
triple tips like the bottoms of your headers: get down there and clean and dry them
when you wash the bike.
-Mike