don't even think that TI is a good material for a crank. It doesn't handle all the hramonics that a crank deals with very well. TI is pretty brittle generally speaking. I would definitely say that no one makes a TI crank for the Z. I mean how many 4340 chromo cranks are even available for the Z??? Doesn't the guy say that the pistons are TI also. That would suck!!