So, why do you want a lightweight flywheel? Increased sex appeal of course. But aside from that, you'll discover your engine is more responsive to your right foot. Blipping the throttle to match a downshift, letting the revs drop when shifting up - the engine will react more quickly. It'll make your Miata feel more like a sports car. It's also SFI certified for safety.
There is a small but measurable improvement in acceleration in the lower gears thanks to decreased inertial losses, but it`s not a huge difference.
Weighs 8.4 lbs. Steel with an integral ring gear. Fits NC models with either 5- and 6-speed transmissions. The flywheel may cause some harmless drivetrain noise on closed-throttle deceleration - this is a characteristic of lightweight flywheels.