I had the same problem w/ mine, it turned out to be the clutch pedal vibrating, especially when I took turns, it got progressively worst, the way to check it is too place a little pressure on the clutch pedal when you hear the rattling, if it goes away, then you'll know, I eneded up replacing the clutch quadrant and putting on a firewall adjuster and that solved the problem. Let me know if this helps. 
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98 GT convrtble, March Underdrive pulleys, K&N filter, homemade ram air, Steeda Tri-ax shifter and Strut Tower Brace, billett MOMO shift knob, billett a/c knobs, billett emergency brake handle, UPr's cable adjuster and triple pick-up quadrant, smoked headlight covers.
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