I threw together this video very quickly while I installed my splitter. Sorry for the fairly terrible quality, but I think it covers just about everything.
Overall it is an easy install and I would recommend a 2nd set of hands helping you out to make sure the splitter is aligned.
https://youtu.be/ePhEIuhijIw
You can order this part from GM directly or at your dealer, but these sites have better prices:
GMPartsOnline -
http://bit.ly/1qBkaCu
GMPartsDirect -
http://bit.ly/1qBkgKd
ShopChevyParts -
http://bit.ly/1qyRQAk
SS Part Numbers:
Paint to Match - 23301611
Red Hot (G7C) - 23301612
Summit White (GAZ) - 23301613
Silver Ice Metallic (GAN) - 23301614
Nightfall Gray Metallic (G7Q) - 23301615
Mosaic Black Metallic (GB8) - 23301616
Black (GBA) - 23301617
LT Part Numbers:
Paint to Match - 23301618
Red Hot (G7C) - 23301619
Summit White (GAZ) - 23301620
Silver Ice Metallic (GAN) - 23301621
Nightfall Gray Metallic (G7Q) - 23301622
Mosaic Black Metallic (GB8) - 23301623
Black (GBA) - 23301624