[Rodrunner]

From what I've read in a couple different threads, I believe there my be some misconceptions about the cost of installation being included in the purchase price or not.

The following is from Robin Lawrence at GMPP on the subject:
"Parts ordered on a LPO include labor to install. Parts from GMPP do not cover installation."

In other words, if it's not on the window sticker (CAI, Shorty Headers, Borla Catback, Splash Guards), you also pay to have it installed, or do it yourself.