It seems that many are doing the OSCAI, so here's my version.

The O.D. of the pipe on the bottom of the factory air scoop measured about 3 1/4". I wanted something that would slip over this. AutoZone has a flexible air duct called "Mighty Flow" which was about 3 1/2" X 36". There were clamps incorporated into the ends of the duct, however, they didn't seem to tighten enough so I cut them off. I went to Home Depot for the rest of the parts. In the department where they have clothes dryer ducts, I got two 4" clamps (the kind you use a screwdriver to tighten.) In the department where they have drainage pipes for lawns, I picked up a 3" PVC coupler which was about 4" in length and a 4" black square drain grate cover. I cut out most of the grating on the drain grate cover and then glued it to the PVC coupler with PVC cement. After removing the plastic engine splash guard, I cut a 3" hole in it to the driver's side of the radiator. I cut the hole in the area which angles upward hoping that air would be forced into the duct. I removed the scoop and used one of the 4" clamps to secure the duct to the scoop. The scoop was put back on the car. I placed the grate-PVC pipe combo through the hole in the splash guard from the outside in. I attached the flexible duct to the PVC pipe using the other 4" clamp making sure the clamp was as close to the spash guard as possible. This "locked" the drain-PVC combo to the splash guard. I then reattached the splash guard to the car.

Good luck to all doing this!