GSRRacer95 i tried out those ebay spark plug covers (my car didnt have one for some reason)..the plastic is flexible as hell and will curve down where the holes are at when u tighten the nuts. if you dont tighten them enough, the nuts loosen themselves and will eventually come off.. if you tighten them as tight as they should be tightened, the spark plug cover breaks. i think mine started to crack even before my nuts got lost. ....... ha yeah i replaced it with an aluminum one and i havent had any problems with it so far but it cost alot more than the ebay one.....