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I've never driven anything but the lightweight flywheel on the 911, but based on other Porsches I've driven you can take it down the road a bit and as you upshift push in the clutch and instead of shifting, watch the tach..if it drops much and rebounds (or even cuts off) you might have a lightweight flywheel.
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1990 C2 Cabriolet Guards Red 
'81 928 Zinnmetallic Project Car (sold)  )
'87 944na Maraschino Red Metallic (sold) )
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