I bought my bike used, how do i see if i have have one? Before i buy one and find out the hard wayt

It would be plugged into the harness under the throttle bodies and the unit would/should be placed up on the ram air tube inside the left front fairing.  You should be able to see it looking down from the top.

If you pull your left side cover off you can look and see if you have a PC.  If it isn't mounted to the left ram air tube then it could be mounted to the metal bracket just behind it that has the black foam. 

You could just look in near your left foot peg. The plug is right in there. You should be able to see an aftermarket cable being plugged in! With the OEM plug on top of that. Then your not hunting for where somebody might have hid it.

Anyone able to snap a pic near the peg so i know what i am looking for

Here is a link to the installation instructions and you can check the photos.

http://www.powercommander.com/powercommander/powercommander_v.aspx?mk=8&mdl=144&yr=17-013&pcVersion=PCV&PartNum=17-013