To boost/improve Yaris, or move on....?

[why?]

Originally Posted by Jason@SportsCar

The stock setup (flywheel/clutch/pressure plate) is 26lbs, our lightened setup is 18lbs. While it is a significant difference, it is totally street-able. The problem with most race setups on the street is to aggressive of a pressure plate/clutch combo, some of them are an on/off switch. We used a 3-puck solid hub clutch (weighs 1lb), but a very mild pressure plate - its not like we are trying to hold back 300hp - so it is easy to drive. The flywheel alone wont have much impact on how the car drives, it just lets it rev more freely.

1 pound! Do I even want to know how rare and expensive it is before I get my hopes up? Is it something that can last on a daily driver?