A true cold air induction system needs to be a minimum ove 24"(Thats right 2 ft) off the concrete.
We have done countless testing of this in the hot summer and cold winter here in Tx and found that the heat off the concrete or asphalt is 10-18 degrees hotter on the same vehicle at 2 ft off the ground.....If I could make it look right I would get my air 20 ft up...but not possible and keep it clean looking.
BTW-I challenge anyone here to run the same test we ran..Our test was a TRAILBLAZER SS WITH THE FILTER BEHIND THE LOWER FASCIA AND GRILL AT RIGHT GRILL .
A great read -
http://www.kennebell.net/techinfo/ge...AirWARNING.pdf