Hey Ben, the Ls7 motor, I believe is a highly tuned motor to start with, and is not like your typical Ls1 or 2 where you can just remap it.. if I'm wrong, somebody please jump in here.. Lets say its like buying a highly tuned HSV motor car and trying to get more Kw out of it.. you might, ... hmnmm wont happen. You really have to start modifying the engine like the heads, the exhaust, cams lifts to get more out of it.. but what for?.. if you want more grunt, go turbo buddy, or even beta yet.. get a supercharger on it... anyway, owning a Z06 is the cream of de cream.
Try SR performance buddy.. he has worked on theses cars and both Steve Rosenfeld and his brother have extensive Corvette Tuning experience... unless you want to set up a twin turbo setup.. ?
http://www.srperformance.com.au/