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Extra channels can be added to a CB.  Just not legally.  The only frequencies that are legal for a CB, are the 40 preset channels that come on the radio. 

You can do what you want, but when you start interfering with the HAM bands without a ticket, it tends to make them upset.  They study for their ticket and take their bands very serious.  If it was me, I'd just use the channels that are allowed.  Study up and get your ticket to open up more freqs for you.  Good luck.