my OLD xcal1 needed to be returned to stock first (so i was advised by my tuner years ago), but new ones you can just switch straight to the next tune.
people have been raving about the hybrid tune for a bit, so i was running it for months and it seemed pretty good. decent power and slightly better mpg (less than 1mpg). seemed to have a little more "down low". seemed great until i raced a coworker a few times. on the hybrid tune we were pretty close, i barely inched him out. switched to the race tune and i now pull him. i have now switched back to the race tune, which i ran from day 1 until all the hype about the hybrid tune....the hybrid tune is great, and i really like it, but it does leave a bit up top with slightly more low end. it is also a little easier in the rain with 4.10's than the race tune, but sheet, its all good!
07 gt, CMS cams, hurst, CAI/tuned, LT's, o/r h, m80's, FRPP mani, UDP, lowered with steeda 1.25/1.5, exedy mach 400/race flywheel, 1-pc DS, BMR upper/lowers, 4.10's, CHE brace with TL's, and a few other things that dont add up to much.