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Don't know if this thread is still being read but the advertised gain from the GMPP tune kit was 30bhp.

I was more interested in the additional 80 lb/ft it offered. We still get hung up on bhp. Frankly these cars may be 'light' compared to many modern cars but as a two seater they are hardly svelte at all. The torque increase was quite noticeable in the '07 GXP I had the GMPP kit installed on.

One thing that makes me hesitant for several tunes is that vague terms are used to describe the results.
 

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The GMPP tune is about 290BHP not quite 300 as mentioned. The torque is well over 330.
 

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Advertised as 290bhp and 340 lb/ft and I always wondered what real gains were
 

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According to GM:

Cobalt 2008-2010 HP & Torque ratings:

280HP @ 4,700 RPM

320 lb,-ft of torque @ 4,300 RPM

This performance upgrade maintains no-lift shift feature on Cobalts and HHR's and adds it for the Solstice/Sky.

Note:

Solstice SKY HP & Torque ratings:


290HP @ 5,200 RPM
MT 340 lb,-ft of torque @ 3,600 RPM

AT 325 lb,-ft of torque @ 3,600 RPM

HHR HP & Torque ratings:
290HP @ 5,200 RPM
MT 315 lb,-ft of torque @ 4,800

AT 315 lb,-ft of torque @ 4,800
 
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