For street driving something too light will make engagement difficult. Also you could end up getting misfire codes from the flywheel being so light. The way the car manages timing, by taking that much off the flywheel (which on these cars also has the timing marks) would essentially throw the ECU off due to the different rate of acceleration on the combustion stroke. So its nice to have the car rev fast and a lightweight clutch assembly will allow you to row through the gears more quickly, but going to extreme will just make you regret it on your daily driver.
We just finished installing the OSGiken TR2CD twin disc clutch in a 2011 NISMO, and I dont think you really want anything much lighter than that haha.
Thanks,
Alex Goodwin
AlexG@motionlabtuning.com