Paul,
If the rattling is ocurring at low rpm ... say 1000 - 2000 rpm, then it isn't anything to worry about! Just such noise has been the reason for much R&D at Porsche in the past 25 years ... and some ideas that perhaps shouldn't have been incorporated into production models, such as the infamous SC 'exploding' rubber-centered clutch disk, have resulted from that R&D!
Some noise is perfectly normal from a transaxle, and only when Porsche started catering to the luxury, upscale lawyer/doctor clientele ... did NVH concerns start to impact and override performance goals in the '70's and '80's.
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Warren Hall, Jr.
1973 911S Targa ... 'Annie'
1968 340S Barracuda ... 'Rolling Thunder'
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