Good post ...
One thing to remember is that this infact is a axle dyno and does not take into consideration losses incurred with heavier wheels/tires and different rolling daimeters and contact patch. It also looks as if the dyno was running is inertia mode ... I don't see any load values plugged in or really even if GM has published the power@50 numbers yet for the Sol.
Here is some good reading on this type of dyno:
http://www.dynapack.com/dynapack.html
The DynaPack is a good tuning tool and shows excellent repeatability BUT because of its "wheels off" interface make its number hard to compare to any other dyno ... As I have show in another post the wheel and tire weight along can attribute to substantial chages in measured HP.
Here is the thread to entertain more details regarding just how much power is lost in wheels and tires:
How much power do 20" wheels rob ... dyno inside
Now if that much is lost with adding 10-15 lbs / wheel .. imagine how much is gained but removing 45-55 lbs of wheel and tire ... Just something to think about...
Again .. congradulations on the dynos, I just wanted to put somethings into perspective for those who may not be as dyno literate.
A power adder will wake up this platform for sure ... 250-300 rwhp would be FUN if not completely thrilling.
If you want to ... I have a full dyno facility I am willing to offer up at no cost to provide the Solstice comunity with comparitive values on my DynoJet 248C which is a more common place dyno. Complimentry free tour of the MagnaFlow facilites if you are intersted at all as well.
Just a thought ...