the Polini Speed Bell, is a great Bell, it has Bigger holes for cooling, a lot lighter then Stock, built in cooling fins, 21 Grms, will give you good top end speed but much slower take off, 16 Grms would be right in between good take off and good high end now if your looking for City then 10 or 12 Grms, would be a faster Take off but not very good on High end speeds.
Now as far as the Torque Driver there's a After market one coming out soon.
as far as the variator Dr.pulley variator , Polini variator ,Malossi variator makes them, these variators are much Lighter then Stock.
as far as the Clutch Dr.pulley Hit Clutch or Polini Speed variator are a good choice and are all so a Compact Lighter Design then the Stock.
Elliott,