If I'm reading it correctly, you're asking if you need to upgrade your ITR camshafts to use adjustable cam gears?
For the first question, I'd say no. Adjustable cam gears are mostly bling if you don't have serious mods. But if you get aftermarket camshafts, it's probably a good idea to get adjustable cam gears so you can tune the car according to the more aggressive camshafts.
As for the second question, skunk2 have specific cam's meant for engines with forced induction. They're their turbo cam's.