syncros
There is a member here who has had carbon fiber lined syncros made, and was selling them. I don't remember the screen name he uses, I ended up getting them from another member who decided not to use them. Try searching. They r supposed to shift smoother, and allow high RPM shifting into the range the M5R2 doesn't really like. I have not shifted a trans that is using them yet, and it will be awhile b4 I install mine.
Adam