well my setup is. i have my precats and i have no main cat i have a test pipe that then splits to two pipes and goes straight to the back of the car and goes to 2 SVT rear mufflers and tips... at idle it sounds deep and mean, but when u get in to it around 5 grand it starts to get raspy. but i got the set up for free so i cant really complain and its not to loud inside of the car. my set up is the opposite of what u were thinking.. but this is just my 2 cents..
i also have a optimized Y-pipe, and 99Mystique ATX likes to say my car has balls now... :crazy:
here is the best pic of my setup