Originally Posted by esfourteen

I run a competition clutch steel flywheel (~17lbs) and a stillen UD pulley, it's well worth it.

Drivability wise: the car revs much faster, throttle lag is as non-existent as you can get with drive by wire (im uprev'd as well). Downside with the flywheel is the chatter as the transmission warms up below ~2k rpm. We just have noisy transmissions, which is why nissan put a 34lb dual mass beast of a flywheel in the car to begin with.