The OS .21 TM is a drop in I don't think they make a TZ in the .21 size. If you are refering to the TM then yes I would think you are correct get the Revo style header. Please don't think I am knocking you on this but Why are you putting a OS .21 in a Jato? Mine with the 3.3 has stupid torque already....more would make it un-drivable.