If it's one of the aluminum pieces of crap on the market, just say no. They cause all sorts of drivability issues and just generally suck. I've run a few on several different cars, all of which went in the trash after a week or two.
The only non-stock flywheel I'd bother using is a good chromoly design from the likes of JUN, or one of those that come with the Giken/HKS/etc multi plate clutches.
Steel is your friend.