Welcome to NICO..
I hate the views counter on these threads... because you see like 20 people look at your post, but yet no one answers. Or, alot of people just don't know the answer. This is a great forum with tonnes of knowledge and some REALLY great guys (and the odd girl) on here that will help you when they can.
Zozo is right, there really isn't that many exhausts out yet for the Sedan. "Stealin" is IMHO pretty much the best and only choice. yes they are expensive. But there is a reason for it. You are getting a reliable, high quality kik *** exhaust. You drive a G...why would you want to cheap out??
I usually go on youtube for sound clips as well start here
http://www.youtube.com/watch?v...earch=
That sounds really good IMHO.
Let us know what you decide and I hope that helps!