i have a 98 gs300 and wondering how a greddy pe would sound like on it with the cats and resinators on

 

have you searched yet? There is a video clip here that had an exhaust "competition" at one of the Cali meets a few years back. All kinds of different exhausts in that clip.

edit - now that I think about it, I have driven a GS4 with the PE setup...it has anice mellow tone, but still has that aggressive crack to it.

 

i dont want it to loud tho, i know that the greddy pe is a full catback, and maybe i just install the axleback portion on the car, then it shouldnt be too loud