the main reason a people get a ligth flywheel is to saty in the reves, i believe the reason is phyisics....A light object takes less force to get to speed, and less force to stay in motion.
the lighten flywheel is good for auto x, and road racing because its easier to stay in the power band.
A heavier flywheel from what i understand is good for drag racing...im not quite sure on the specifics on that.
I have a fidanza (about 10 lbs) and it works great for my auto x and road racing fun.
big diffrence between the stock an this one.
I think you will like it.
Lupe