I have the 7 speaker monsoon package 6disk changer but I want to get a better sub the 8' that came with it isn't working for me I want to get a 12 or 2 10's a base tube "6 8' subs" in a tube

how hard was it to install do I have to take my radio out or can I just unplug my 8 that is already there?
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Thanks and have a wonderful day!

Klint T.
2007 Black Lux, Blinged out