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Most people I've seen with it get around 280whp and 310wtq and the gm stage kit is like $600 plus labor. Other tunes get you at or over 300whp and around 340wtq for about $300. I think it's a little weak for the price.
 

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Did mine on my 2009 ss, plus ive done quite a few on other cobalts and even a couple hhr ss.

The tune gets rid of the adaptive learn in the ecm.
Boost increased from max of 15psi to 22psi.
Supposed to get rid of the high speed fuel cutoff. ive only been to 130mph since the tune so i cannot verify this.
GM says 280hp and 325lb torque, probably fairly close numbers.
GM tune kit is the only kit available that wont void factory warranty.
Online it can be bought for around 500.00, install at a dealer is prob around 150.00
Dealer will have to install due to needing a computer reflash for programming.
 
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