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I just finished replacing all speakers (10” sub) and added 5 channel JBL amp. One channel dedicated to the sub. I left the factory head unit for now. I recommend the the factory amp replacement kit from ********. Makes wiring super easy! I’m not sure where you plan on mounting a 20” sub. I mounted a replacement jbl sub by drilling new holes in the stock housing. You would have to do quite a bit of cutting to add a 20. Not sure you would need it either, but just my opinion.
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