well you aren't really "gaining" any HP, but your engine is not working as hard to get the HP to the wheels.
with the lightened flywheel the engine will rev and and come down much faster.
there is some debate as to the benefits of a lightend flywheel, but i always thought is was a cool idea, although i have no first hand experience with one.
someone with more experience can probably explain much more than i.
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Joe
Previous modded F1K Pure #795 owner
Traded in for Blue '06 GTO July 1 361RWHP/359TQ 1/8 MI:8.56