As soon as GM or my warranty go belly up, the Twins are going on!
STS (Squires Turbo Systems) has already developed a twin turbo system for the LS3 that put down over 600wrhp on a C6.
The turbos are very easy to install, and are installed in the muffler location insted of under the hood so they stay much cooler. They also have the added benifit of huge airflow from under the car helping to keep them cool.
Twin turbos will eliminate most of the lag that turbos have been know for. Plus, they will give you a 5.4 pound to 1 H.P ratio.
And did I mention that the entire system, including the tune and installation is under $8000?
I've been hooked since I saw a 04 GTO A4 go over 140 in the 1/4.
Here is a link so you can see for your selves: http://www.ststurbo.com/c6_corvette_