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I have that rattle too. It is very faint, the stereo has to be off to even hear it. Usually hear it going under 40 mph (in 4th gear) and very lightly accelerating. I guess I'll get under the car and look at the heat shield. The sound seems awfully quiet to be pinging and I only run Top Tier 93 octane gas. Of course, I guess some carbon build-up on the top of the pistons can up the compression just enough to cause pinging.
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