I have a CC stage 4 clutch and I think it's the ACT 11lb. flywheel. I kind of wish I still had my stock flywheel. Even though the light weight is cool, and I can rev faster on the top end, there are a lot of annoyances on the bottom. You really have to be conscious about revving harder to get the car to go, especially on hills. I often find myself spinning my tires trying to go. Also, trying to accelerate, I really don't see a difference, sometimes I think it takes longer for the RPMs to climb until you get near the top once you get near the top, the RPMs climb like a rocket. I had to learn how to shift early so I didn't hit the rev limiter when I did start going because it comes so fast. So it's pretty great for racing, but for daily driving, I would say keep the stock flywheel. The last thing that annoys me, which I'm not sure if it's the clutch, flywheel or both but, when i try and go in reverse, it always grinds, like the clutch doesn't want to slow down enough to open the gate.