Mine have been on since April of 2011...they haven't warped and do not rattle, maybe before you say what they will do you should do a little research. As far as I am aware no one here has had a problem with warping or rattling when they are installed correctly. They are made of aircraft grade aluminium and are a lot less work then painting and a nice alternative to painting. Also the lettering is NOT a decal it is engraved/stamped into the metal. Lastly my covers look like new and have been on going on 3 years.