exhaust help

i got a 1990 gt and i have all o/r exhaust. bbk longtubes, bbk x pipe, and bassani mufflers. i love my car and its sound but itss not what i expected. i really was hopeing for a realy raspy sound but not what the outcome was. so i believe that the headers and x are in the right direction but what could i do muffler wise to make it raspier?

thanks for the feed back guyy. my dad was sayin the same thing but idk.. i hope someone will know what ones they were.