CTR cams only differ from ITR cams in 97-99, and at that its only 3* more duration on the intake vtec lobe. 00-01 ITR & CTR are identical.

I'm currently planning out a CTR/ITR cam swap myself for my GSR. I went ahead and opted for ITR Outers and Portflow Inners with Ti retainers. Its a small investment to give me the peace-of-mind to know the springs will be doing their job after the cam swap. And I want to make sure this motor stays reliable while I build the "real" motor

Adam