This '04 Subaru WRX cti 2.5 turbo 6 spd. has all one piece brass synchro rings, our local Subaru dealers parts illus. show 2 of the rings to be three piece rings, one on the 1-2 Syn. and one on the 3-4 Syn. both on the 5-6 Syn. show one piece rings. He claims ... Login to read more.