[MJN]

I just switched from a steel flywheel to an aluminum one over the winter and really like the difference in engine response. The engine revs much quicker and freer. It is very noticeable. The only slight downside is that it is that much harder to drive 'smoothly' around town and at lower revs. If you have a lumpy cam that bucks at low revs it'll seem ten times worse with the aluminum flywheel.