My mods were done using Mikesr's hole saw into the first baffle and bmwhd's idea of drilling half inch holes into second plate. He reccommended 4 but I goofed on first hole so I had only room for 3 holes and that is what I stuck with.
After a summer of riding it has mellowed even more.
That was it. If I had the bucks I could sneek away from my accountant (wife)I would buy some Thunderbike pipes, but there are a lot of other things ahead of that and stock mods are the least expensive option.
ed