Originally posted by 420AYE
Alright. I can't personally say that i own a allum flywheel. but theoretically, a lighter flywheel is lighter, and will result in less spinning momentum, so you don't coast quite as well. It would probably be more noticable in a manual than an automatic if that is what you are. A heavier flywheel on the other hand would cause you to coast very well, but have slow accelleration.

You're kind of right, but a lot wrong. Switching to an aluminum or lightened flywheel doesn't add or remove any power. It just changes it from kinetic energy to potential energy. The effect is that the engine doesn't need to produce as much power to spin the flywheel, so that extra energy is transferred to the wheels. The lighter weight also means it will spin faster, thus making it easier to move through the RPMs in either direction. An automatic doesn't have a flywheel. It has a flexplate(the same one the modular units bolt to) and a torque converter. Also, in a manual transmission, you never "coast." You are either accelerating, maintaining speed(through throttle position), or engine braking. As for ETX, the flywheel replacement is not the flexplate. If it replaces the flexplate(with the ring gear on the actual flywheel) then it will be a non-modular setup.