Alright, so i pulled out the plastic below the windshield to look for a spot for the cabin filter. There was no filter there at all. Since i bought the car like 6 months ago i figured that someone had taken it out and never put a new one in. However, i went to two different parts stores and asked for one and after searching their computers they said that they couldn't find one. I started to think that maybe they just dont make them for a Grand Prix. Does anyone know for sure?