I believe different turbo will prefer different rpm range and the overlap the cams, don't quote me on this, hense I discovered this from my trust td06 setup ,and when the car on dyno we discovered:
[264ex cam + stock ex cam gear] v.s [264 ex cam with ex cam gear(4 degree retared)] only happen after 6000 rpm, powerband expanded..about 12kw..the cam still not dialed in at its best setup, so that's a rough guide..car will retune next tuesday, so will let you know.