Belt drive instantly adds usable HP and RPM at 60 HP @ sea level and 40 ish at elevation The track loads become very apparent, In fact the 2022 2.6 yeti track has Less total paddle area than the 2021 2.5 track and claims are it holds rpm better and it should for the guys at elevation , The Yeti kit is Much lighter than all the other kits, No other kit has Belt drive, Carbon tunnel , every bolt/nut is titanium and all the shafts' are titanium. T sled has Steel shafts, steel bolts, Chain drive and aluminum tunnel. On the snow weight is everything and allows more usable HP . {Lbs per hp }. So I'm pro Yeti simply due to the advanced materials/design used.. Rotating mass quickly eats RPM , The Vernon snow testing reflects this on the Yeti vs T sled. On a gear box bike the track speed in any gear can be calculated with good track speed gains with an additional 4-500 rpm. The CMX track is a good design as well however the belting is Thick ,same as a sled track, The track was 6 lbs heavier than yeti track and struggles to hold the same RPM mounted on the same bike run side by side, CMX does share the belt drive system.