Here's the description (from both the distributor and also spec's own site) of the spec stage 1 sprung clutch I bought:
The SPEC Stage 1 Clutch Kit features an integrally molded carbon kevlar-based, high performance organic lining that offers smooth engagement and excellent life. This lining has an integrally bonded steel backing for strength under high clamp loads and temperatures. The hub is double sprung with spring cover relieves for flexibility and heat treated components for strength and durability. Best for street and many track/off-road applications.
Features
High clamp pressure plate
Steel-backed and multi-compound woven organic material
High torque sprung hub and disc assembly
Bearing and tool kit
One would think this was pretty cut and dry but the fact is, as soon as u tell them u have a boxster, u will be sent a solid disc clutch, not sprung.
The way to get around this is to contact ur distributor and let them know you have a solid flywheel, and u want a sprung disc despite the fact that OEM is a solid disc. Prob not a bad idea to call spec as well and ensure they understand u want a sprung hub. Make sure everyone in the supply chain understands u want a sprung hub, otherwise u'll wind up with a solid disc clutch.
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