Found this for ya.
~Stock GTS (chromolly) - 13.0 lbs.
~Blitz Active Clutch (chromolly) - 10.5 lbs.
~Toda (chromolly) - 10.3617 lbs.
~C-One (chromolly) - 9.9208 lbs.
~TRD Japan Flywheel (chromolly) - 9.6 lbs.
~RPS Billet (aluminum) - 9 lbs.
~JUN (chromolly) - 8.8 lbs.
~AASCO (aluminum) - 8 lbs.
~Mueller (aluminum) - 8 lbs.
~TOM's (chromolly) - 8 lbs.
~Unorthodox (aluminum) - 8 lbs.
~Fidanza (aluminum) - 7.5 lbs