dude the newer Avinox motors have zero rattle and are the best system out there right now. Either way it will be fine! The majority of your postings are negative about Avinox and idk why. Just go try one. I know you own a Levo, the Levo was my last bike and the Avinox is better in every way. I also traded off a gen 4 Levo last month and that owner was blown away as well. I’m not talking about the bike itself, just the motor.
I had like 1 kom on my Levo, now I have 6+ since owning the amflow and that has nothing to do with the bike and all motor. It’s not even just koms and speed, the listening to customers and getting updates out, smoothshift, the way the power is managed, the integration with their action cams, etc etc.
So needless to say, whether the crestline has an m2 or the newer m1, you’re going to be satisfied either way. Idk how you expect crestline to release details on a motor that the manufacturer hasn’t even release yet…