Decided i wanted to clean my air filter out today or maybe even replace it if it was too dirty. Taking it out and cleaning it was pretty easy and took all of 5 minutes but what i was shocked by was what i found underneath the air filter. Its a small yellow plasticy cover and was lying right underneath - pictures tell the whole story. Now i dont know if this is supposed to be there or not , but i have cleaned enough air filters in my life to probably take a good guess that its not. Now i am not a mechanic but i can assume , safely i am sure , that given its location it was probably stopping some amount of air flow , as such no indications are present in the car while driving , either in the form of low mileage or loss of power / acceleration. Any clues anyone?