I'm pretty new to knowing my way around my own Stang and DIY-ing, but I did discover a while ago that a previous owner (I bought my car used in July 07) had put headers on the car. They're very dirty and I can't even tell you what brand they are or what material/coating they're made of, but I do know they're not the stock manifolds. Is there anything, like maybe a household cleaner or something like CLR, that will clean off the headers so they look better and I can (maybe) find out who made them?