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A lightweight flywheel removes rotating mass off the motor. Going from 31lbs to 13 is a huge reduction. The weight the motor no longer has to waste to spin that thing goes directly out in wheel HP. It doens't give additional HP but recovers some lost HP from the drivetrain.
Funny thing about lightened flywheels is they don't carry any inertia. So downshifting to slow the car down is almost pointless and if your one of the people who push the clutch in at 4000rpm while slowing for a stop sign the car will stall as the rpm has too far to fall, too fast with so little weight on the flywheel that the computer can't catch it on its way crashing down and the car stalls.
You can pop out the clutch again to start the car (kinda like bump starting but your already rolling) or you can just gear into 2nd when your coming to a stop and let the car right out almost a stop in gear, this will keep the RPM from crashing down. Really thats what your supposed to do, you shouldn't be pushing in the clutch at 4000rpm and letting it fall as you coast to a set of lights.
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