Yesterday, I installed a front splitter made by Norm's Fiberglass. I have the rest of Norm's body kit for the Solstice, and the splitter brought it all together and looks fantastic. The fitment is excellent, and it took less than 10 minutes to install. You use the two stock screws in front of each wheel, and the rest of it sits on the top of bumper and is supported by double sided tape. It is not going anywhere, as it is on there really well. The install instructions are really simple.
First, make sure the area where the splitter is being attached is very clean...use a solution that will take all contaminants off, preferably clay.
Then, remove the bottom two screws in front of each wheel.
Remove backing on double sided tape (on splitter).
Fit splitter into place, and reinstall the four screws. Enjoy your new splitter!
Here are some pictures of the splitter installed.
Side Angle

Attachment Point

Top View

Straight On
