So would this flywheel/clutch set-up be streetable or is it a racecar only type of a deal?

I am leaning on the race only side of things. I have an OS Giken twinplate 9", or something like that, and it works great. Actually quite smooth but those little tiny ones, while they would ROCK for response, might be tough to handle everyday.

I'm ready to shoot myself in chicago traffic with a stock setup. Can't imagine with a 5.5" clutch/flywheel. I'm sure you'll have nearly as much fun with a normal sized lightened flywheel.

Meh, I live in the city and really dont mind the clutching. I get used to it I guess. About your question it all really depends on you. How will you react to it. I have heard of some people saying they love the lightened flywheels, while others cannot stand them in the city.

It depends on how much your car weighs. The lighter your car, the easier it is to drive with a light flywheel. I barely noticed a difference in taking off from a stop when I went form the stock 19 lb flywheel to a 10.5 lb flywheel. But the increase in engine response was incredible. But I have a rather light n/a.