put it in comp mode, and the shifter in I. you will see the boost.

 

Of course I've done something to it...1st MOD, Skull and Crossbones air freshener!

 

That's gotta be worth something

 

That's a bone of contention.

 

If you never see the gauge go above 7psi with the pedal to the floor, something is not right.

I have a 2008 Auto SS and use to see 12-14 psi all the time when passing on the highway. Then I got the GM Tune installed and now I see well over 20 psi

 

I suspect the gage is not working properly if it never fluctuates.

 

Possibly...with my foot off the gas, it sits at 20 Hg on the Vac part of the gauge. It shoots up with gas, hitting no more than 7psi with the pedal to the floor. It feels like the car has plenty of balls, but I don't know if it should have more??

 

Roofer, my car acted exactly like yours. Install the upgrade, you will be happy.

 

I have a 08 SS automatic. Moderate speed I see between 5 and 7 PSI when I step in it I see between 10 and 15. I live I. Southern Cali lower elevations idk if that helps but those are the numbers I'm seeing.

 

I hope he figured it out it's been 2 years and 6 months

BTW, the last guy's advice is awesome, get stg-1 you will love it.