Hey Davens,The noise I was experiencing was heat shield rattle. Some bending and tweaking has somewhat lessened the problem...hopefully get it resolved completely soon.
So the pipe, as i said before, is a fine piece of work. Just wanted to let people know they might experience other issues with the pipe swap.
It seems that I'm having the same issue you did, do you know by any chance know which heat shield was giving you the buzzing noise?