i can't tell you right off the top of my head, but someone else could pop in here and shed some light. one setup i know of though is the toomey silencer and right bend pipes don't w/o doing some modding.
ok hopefully someone else might have a list or something but i am pretty sure that the fmf sst requires having a sst silencer (this was for my dirtbike) thats what made me curious.