I know you are always lookng to gain a few HP. I don't know if you know but the ZXT cams have a little less lift on the intake. The earlier cams, it's either stamped "A" or "C" can't remember(double check with some calipers) but it's just the earlier 280z cam, will give you a little more power. The IN and EX lift is the same on them. It sould extend your powerband. I know I have a little more RPM in mine.