Type: Z1 Performance Street Clutch Kit & Z1 Ultra Lightweight flywheel Brand: Z1 motorsportsModels: This package fits '03 - '06 350Zs and G35s (NOT FOR HR MODELS)Pros: Capable of holding the power of all naturally aspirated and, depending on the options you choose, most forced induction applications up to 500 ft-lb tq. At the same time reducing the total weight of the clutch and flywheel assembly to 29.75 lbs vs 46.6 lbs stock, also includes Braided SS hydraulic clutch line

Install time: 4-5 hours

Cons: Clutch play is a little different than stock and less forgiving for a daily driver, but once you get used to it, it's all is good http://www.z1motorsports.com

Stock setup for clutch and flywheel is approximately 32lbs.

Per the Z1 website. The lightweight flywheel weighs 13.75lbs. The stock flywheel weighs 27.6lbs. Clutch disc is probably in the 5lbs range.