Thanks guys. After looking for a while I finally found it... it's hidden up under that plastic cover on the bottom of the car. Now the problem is I can't get the stupid cover off. Any special secret to getting it off? I took all the retaining clips off and all the bolts but one... there's one bolt in the middle towards the front that will NOT come off. It just keeps spinning and spinning. I looked on kiatechinfo and all it says is to remove the clips and bolts... should be simple enough but for some reason one bolt just keeps spinning. I got some pictures of it... I tried gripping on to the other side of the bolt and it still won't come off.
Other side of bolt from above the undercarriage splash guard thing: