Yeah, friend of mine had a GT2 996 and the noise it made under full throttle was great.
He had a 355 before that with a straight through exhaust.... the sound made the hairs on the back of your neck stand up...! Recorded some sound clips of it and stuck them on my webpage.
http://www.briandrought.com/355sounds/
There in both MP3 and WAV format. Enjoy !