I installed the RJM Performance Adjustable Clutch Pedal Assembly today. This has now become my favorite mod. I was never fond of the stock clutch feel and swapping it out for the RJM unit makes a world of difference. The clutch catches much lower now and is much smoother. Shifts are now the way they should be. The install was a pain for me since it's a tight squeeze and I'm kind of a big guy. I'm also left handed which didn't help. I highly recommend this product to anyone with a 6MT.
RJM Clutch Pedal System for 370Z - Fully Customizable Clutch Feel & Stroke
Oh, I also removed the useless weight from the hatch today.