i believe a Trifecta Tune is the only tuner available for V6 at the moment. on a stock car your not going to see any gains, that is why no programmers are out for it yet. GM built this car very efficiently from the get go.
now if you add an intake, exhaust, and headers your going to want a tune. you can look on trifecta's website to see if there is a dyno near you, or you can opt for their mail in tunes where they mail you a programmer and you send it back when your done.
April 2010 Member/Car of the Month
Gone but not Forgotten!