I guess I am not sure what else is needed....I am not going to post physical data on engines collected...cuz that would be stupid. I have answered all of the questions...
Of the people that bought them from Stazi: has anyone installed them and what are your feelings? The vibration that you feel at higher RPM is your crank going ape**** in the girdle. That is what is gonna wipe your engine out. Teh secondary mass is designed to remove the bending of the crank....generically speaking...

Just call me Judge.
People suck.
Life begins at 170mph...until that point it is just boring.....