I remember way back Dan from Motoxotica stated that the 03 silencer would not bolt up to a 01-02. An entire system may fit with some tweaking. The head pipes were changed from the 04-05 models to solve the front tire rubbing against them issue. Head pipe diameter is larger on the 550-650 I believe.
Older Big Gun Systems are loud, loud , loud. I took mine off my 01 470.