AirForce

I've looked around a bit for valences to put on the front part of the car (the Firebird equivilant of the bolt-on Cobra-R front spolier). I've seen one that I really liked on a car that was on e-bay some time ago. It was thin and definately a bolt-on, and had an opening (like a slit) in the middle to allow for air-flow to the radiator. I was just curious where to find one similar to this, how much it would run, and if anyone knew if it affected the running temperature of the car at speed. Any info regarding this topic would be helpful.