I'll give it a shot. The stock flywheel from nissan is heavy compared to an aftermarket version ex. jwt. It allows for better engine response as it will rev up faster, you'll get some clutch clatter though. Nissan went with a heavy flywheel for noise reduction purposes. People tend to upgrade clutches when they make a lot more power but some just do it for the feel. It shouldn't be high on your list of mods unless you are heavily modified or doing heavy engine and drivetrain work and want to limit installation costs down the road.
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2009 Carbon Fiber/Red 370z aka Trish: Sports Package, Meisterschaft full catback, Fast Intentions Longtube Headers, Injen Long Tube Intakes, UpRev Tune: Sold 
2008 Lotus Exige S Club Racer aka Bella, always leaves me smiling
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