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You won't find a lightweight dual mass. Single mass is just that: one piece of metal. A dual mass has two pieces that are held together with elastomeric material to allow some "give" to dampen driveline forces.
Spec does make a sprung clutch (they'll make pretty much whatever you want actually), and if you do go to a single mass flywheel, a sprung centered clutch is the only acceptable way to do it.
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Boxster S
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