Sorry, I'm in NY, so I can't help w/ question 1 or 2.
Any actual tuning should be done AFTER you do any other work (like intake, exhaust, cam etc...), you will get much better results.
IMO, you're better off leaving tuning to someone with L99/LS3 experience.
YES, it "could" void your warranty, if they could blame the tune for the broken part (just like pretty much any aftermarket performance part). BUT, if you did need to bring in the car for any warranty claim, you could just have the PCM re-flashed with the stock tune. Your dealer wont be able to tell it was ever changed.
If there's no dyno-tuners in your area, there are some that offer mail order tunes. I could recommend a few if needed.
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Last edited by POWERFREAK; 07-06-2009 at 07:00 PM.