I have a 2022 Turbo levo and the engine was getting loud with +/- 1000km, it was replaced last week without any discussion, and the new one is completely silent.
I have a SC Nomad with a 36(factory) and it works really well! The 36(Rhytm) of the Levo22 was pretty bad, and with the Zeb the bike become much, much better... And im the same guy with the same weight, same trails.....
We cannot generalize this of 38 vs 36....
I have a Levo comp 2022 that comes with a 36 Rhytm. I run it for 2 rides and immediately change for a Zeb ultimate with 170mm. its like a new bike.... I have 75kg and do a lot of Dh tracks.
My motor on turbo and a lot of climbing, get really loud with some serious vibrations. I will keep to see how much it will last until is tottaly broken. I believe they are making improvements on the present 2.1 motor...