Wow, just now saw this Airwalk - sorry bout that. Hope this helps someone else. lol

Lightweight Flywheel. Ya, put in a 19 pounder (about 12 lbs lighter that stock iirc) - wouldn't want to go any lighter than that since I drive this car on the street. Starting out it chatters a wee bit below about 1800 rpm. But its does accelerate noticeably quicker - almost like free horsepower.

Got it from Zspeed Auto (2015): South Bend DXD Clutch Steel,19lb Flywheel

Hey man I noticed you have a lightened flywheel on your Z, how is it compared to your original flywheel. Noise chatter acceleration your over all impression if you don't mind. I wanna upgrade my clutch flywheel and diff and I wanna go to a lighter flywheel but I'm getting conflicting answers can you help me out?