im trying to find out the difference but not quite sure what is exactly different all i know is the psi of boost...how else can ya tell?

 

Different sensors and CPU programming that's it.

 

Basically just 2 new tmap sensors and a new gm tune done by the dealer. Now a lot of hardware involved with the kit.

 

would i be able to use a gms1 tune withouth physically haveing a stage 1 cobalt?

 

tune needs the sensors
your better off getting it tuned by someone else, like Trifecta or HPT if your just looking for a tune

 

where can i get those tunes at?

 

There are tuners all over. Go read up on the tune sticky thread. Most of them are listed somewhere in it.

 

Hp and Q increase. And warranty.

 

At that point you might as well just get a custom tune. With a custom tune you don't need the gms1 sensors to begin with, it just makes things easier to dial in over 22.5psi for the person tuning the car.

If you just flash the gms1 tune without the sensors you are going to be a world of hurt and the car will not be happy in the least due to the stock 2.5bar sensors and the 3bar gms1 sensors being scaled completely different from one another.