flywheel is aluminum at 7.5lb (stock flywheel weight of 15.4lbs).
My 53lb flywheel could beat up your flywheel!
It grabs fast and hard, but it's still able to slip just fine, it just does so within a much narrower range, and it's usually accompanied by the groaning.
The flywheel is interesting because it doesn't behave consistently on rev-down. This is entirely due to the fact that I haven't yet modified my ECU software; sometimes it spins down slowly, because the engine is still managing spindown by tweaking the fuel flow, and other times, it drops like a rock.
That's not flywheel behavior, though, that's computer behavior (like rev hang, except it sounds like it's not actually hanging, just dropping slowly).
I quite like it, in no small part for the fact that my car is now a bit difficult for any geek off the street to just hop in and take off; it's one more layer of disincentive for people to ask to borrow my ride (and then of course there's the ego boost of "I'm the only guy who can drive this thing well").
My car's pretty easy to launch but someone who doesn't know how to detect and drive a low-RPM engine may blow it up before they get far.
1980 Buick LeSabre 4.1L 5MT
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Humans have rear-biased AWD. Cows have 4WD