Right now I have shorties going to custom 3" y pipe, 3" dynomax in/out muffler where the cat was, straight 3" over the axle, split and exit (all mandrel bent stainless). What kinds of changes will I see from swapping out the SuperTurbo for a 3" bullet. Will there be changes in tone, etc where it's so far upstream of the exits? I'm thinking it will be much deeper toned. Ideas?

It will have a sharper, cracklier sound. It will definately not have a "deeper tone".

So more like a loudmouth sounds?

I've done a lot of work myself and will attempt just about anything, but I like to test the waters here. Any alternatives/is a bullet recommended? My exhaust is very quiet/mellow now and I wanted to beef it up a tad.