IMO jon, if you want what you are looking for, go stock downpipe to a four inch strait pipe.......it will give you plenty of sound but wont be that obnoxious drone some five inch systems make...
If you dont like that suggestion, look at some of the banks mufflers they put on thier exhaust, they are meant for a very noticable sound. Banks may be overpriced, but they deliver EVERYTHING they promice..nothing more and nothing less...