Aerox CDI is not restricted no. Stage6 pro replica isnt the best exhaust but if you are buying a whole new setup in the summer than it is good enough for the time being.
On that new setup, if inner rotor ignition is neccesary.. im not sure, with that C20 I'd say yes because a C20 loves a lot of RPM so I'm guessing that cilinder you mention likes to run a lot of RPM -> a lot of sparks needed -> a good ignition needed.
Cannot say with certainty tho, I like my low rpm 70cc with original exhaust