I've heard this a few times times. The 66 mph rattle. Check the right side A arm bushings that get rotted by Power steering cantainer drip. Also Front wheel bearing can be warn. Grab a wheel spoke and shake in and out. If it rattles, it's too loose or warn.
http://www.clarks-garage.com/ Susp-08
Hope that gets it.
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1987 924S with 968 Drive front to back, Bilstein Insert on mod/stock Struts, 450# Hypercoils, 28mm Torsion Bars, Weltmeister Adjustable Sway Bars, Lindsey 968 Light flywheel, Spec Stage II Clutch, ToYO RA1's, Auto Power Cage & 6 pt Harness, KLA Strut Brace, Greasy hands, heavy foot, and lots of smiles
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