It was not clear to me that the Signature comes with Carbon Fiber/CF. Making that assumption from this post or were there more? Model X Configuration has begun! - Page 4
I could've sworn I saw it from someone's configuration, maybe Bonnie? One sec, let me see if I can dig it up.
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Here, included: Bonnie's Xcellent Adventure w/X Sig 2 - Config, Delivery, Roadtrip