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I think it is your heat shield around your catalytic converter. I had this annoying rattling that I would only hear between 2300 - 3000 RPM's. Two screws (total of 4) that hold the heat shield together had rusted away. There is a bottom piece that connects to the upper heat shield. In my case the rust was so bad, there was nothing I could do but rip the shielding off. If you have enough of the metal left you can simply screw self tapping screws through both parts of the shielding which would hold it firmly.
Hopefully that's it.
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94 Prelude VTEC - garage queen - SOLD 
03.5 Titanium Grey Mazdaspeed Protege - new garage queen
07 SSM Fit Sport - daily driver
AIM: MarkSpeed94
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