STS turbo is out for a while, they say its 500hp at crank? but there no real numbers and one with STS turbo didnt show any real improvements over stock
(rdditten (STS) 14.2 in 1/4?)
if you going to spend 7k on turbo, then here
http://www.camaro5.com/forums/showthread.php?t=115679
a new Twin Turbo kit for V6 and there an offer for first 5 who buy the kit