Here is some useful reading
Index of stock intake and CAI threads - Pontiac Solstice Forum
The induction / cooling system on the Kappa platform is a bottom breather. The majority of the air needed to cool (and intake air) is captured in the high pressure zone at the front of the car below the bumper. There is plastic ducting that scoops up the air, moves it throught he intercooler and then throught he radiator.
Diddling with the upper grilles has a better chance of making the air flow worse rather than better.
There is some evidence that opening up the hood vents has a positive impact on air temps under the hood.
Function Hood Vents
JRinKY took thermal measurements some time ago when there was a long running conversation about the benefits of a cold air intake that draws air from under the hood. My recollection is that he found that the temps at the intake are within a degree or two of ambient as soon as the car is moving forward at any appreciable speed.
I am not sure what technical problem you are trying to solve but if its to get air into the engine bay, then the current ducting system does that very well. If its to allow air to exit under the hood, then a more functional solution is one of Norms vented fenders that will allow exhaust air from the rear corners of the engine bay which appears to provide a much better air flow.
See the "Functional Sky Fenders" link on this page
Saturn Sky at Norm's Fiberglass