Here we go with some soundclips of the LS3 SS along with a few others..
http://www.dpccars.com/car-videos-09/03-21-09page-Muscle-car-exhaust-comparison.htm
As to power, the only one dynoed as of now was a 6 speed LS3 that was not broken in fully yet. It made 370rwhp stock. Figure an easy 380rwhp when fully broken in.
As to the handling, The SS posted a 8.19 at the Nuremburgring. These are cars close to its time it beat.....
8:22 Nissan Skyline GT-R R32 Motoharu Kurosawa Best Motoring Video Special DVD
8:22.8 Chevrolet Cobalt SS Turbo John Heinricy AutoBlog (9/2007) Wet Track
8:22 BMW M3 E46 Horst von Saurma Sport Auto (12/2000)
8:22 BMW M Coupe E36/8 Horst von Saurma Sport Auto (10/1998)
8:24 2004 Subaru Impreza Sport Auto (05/2004), Sport tires[citation needed]
8:25 Lotus Exige S Horst von Saurma Sport Auto (06/2008)[25]
8:25 Jaguar XKR Horst von Saurma Sport Auto
8:25 Porsche Cayman S Horst von Saurma Sport Auto
8:24 Mitsubishi Charisma GT Evo VI Horst von Saurma Sport Auto (11/1999), Sport tires[citation needed]
8:25 Mitsubishi Charisma GT Evo VII Horst von Saurma Sport Auto (11/2002), Sport tires[citation needed]
8:26 Audi S5 Horst von Saurma Sport Auto (01/2008)[26]
8:26 BMW 335i E92 Coupe Horst von Saurma Sport Auto
8:26 Nissan 350Z Horst von Saurma Sport Auto (10/2003)
8:28 Porsche 911 Carrera (993) Horst von Saurma Sport Auto (07/1997)
8:29 Audi TTS Coupé Horst von Saurma Sport Auto (10/2008)[27]