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Originally Posted by Chrisp
2. Loose heat shield - give them a wobble to see if they've worked free.
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Note that there are two kinds of heat shields around that area. The first is the shiny aluminum stuff that is easy to bend and can easily cut you if you graze it just right. If the edge of some of this stuff is touching part of your exhaust, it may buzz or make noise.
The other heat shield is steel, which loosens with age and heat expansion/shrinking. It's found ahead and behind your cats. I had a vexing, tinny rattle at certain low rpm's that turned out to be one of these heat shields. I put the back of the car on ramps, started the engine, asked the wife to rev it a bit, slid under the car, found it, and whacked it real good with a hammer a few times to bend it and make it fit tightly against the piping after the cat. Problem solved.
And whacking the crap out it with a hammer after six months of listening to it was very satisfying indeed
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