After I drive my car for a while, sometimes I start to hear this sound, and it sounds like a metal piece is vibrating or clanging/rattling against some other piece of metal, and I put my ear under the hood and best I could tell it was coming from near the exhaust manifold/headers, i'm pretty sure that's where it was coming from. Anybody know what could be causing this noise? Is the heat shield loose or something?
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