[MJN]

The aluminum flywheel will reduce the rotational inertia of the drivetrain allowing it to accellerate quicker. The engine will feel more responsive. The down side is that if you have a very aggressive clutch package you may find it difficult to pull away from a stop smoothly without slipping the clutch a lot. I have an aluminum flywheel in mine with a Kevlar faced disc and it is not at all bad to drive until you get the clutch hot then it'll grab. If you're building a cruiser get the steel flywheel if you are going to be racing at all go with the aluminum one. Either way get a scattershield (blow proof bellhousing).