There are two issues. The first is the pulse of the 4 banger. It is very different from a v6 or v8.
The second is the size of the pipe.
If you get a Moroso spiral muffler, it has 8 - half moon baffles and it results in 8 type pulses. It is louder than you likely want so you'll want either the CAT or a resonator with it.
If you go to a 2.5" pipe system, with a 2.5" muffler you lower the pitch of the exhaust. If you do those two things, the engine will not sound ricey. The reason the ricey ones sound the way they do is that they typically run a 1.5" pipe into a fart can and think it will replicate a larger displacement. Wrong.
You want a fatter pipe, the same as they use a fatter pipe in a pipe organ to cause a deep rumbly sound.
I hope this helps.
I forgot about your turbo. It muffles the sound as well, so the Moroso by itself with the 2.5" pipe might do the trick
[This message has been edited by Arns85GT (edited 06-14-2010).]