2.8 V6 turbo saab

[2006aero]

Please excuse me if im in the wrong area but it should relate to the gm V6 2.8 turbo.
I would like to build a tune and get my car from 250 bph to over 300 bph.
There are companies that sell tunes like Vtuner but charge a fortune for their computer software.
Are there limitations to building a tune with Hptuner software or can i build a great tune on the E9 ecu thru the obd2 port.
I know i can load a tune thru the softwhere but if i am only able to firm up some shift points and raise the rev limiter, tire size, i would be very disappointed.

Can i build a tune like Vtuner or JZW?

[Bill@HPTuners]

You can download our software at www.hptuners.com so you can try it before you buy it to see if its what you are looking for. The 2009 Cobalt SS/TC file in the samples folder is going to be almost identical to your application(uses a near identical pcm) so would be the best file to view, I believe theres around 150-200 tables to adjust so a few more than just a rev limiter

[2006aero]

What do i need to use the demo software,,, a particular cable for my obd2 connecting to my laptop?
Can i read diagnostics on my car with the demo ,,,, or make any changes?