All the wiring to the rear sub-woofer. might be there so that should not be a problem.
I would guess the rear sub woofer assembly, that also contains the amplifier, would be expensive, then you have to replace at least four speakers (one in each door) since they are an upgraded speaker. I believe the A-pillar speakers are the same. I believe the radio is the same, just minus the extra plug and wiring for the Monsoon system
It would probably be easier and less expensive to purchase a good aftermarket amp and small or larger sub woofer, and replace the door speakers with better speakers.
And yes, it does sound great, at least to these old ears.
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Black Sheep Hummer Squadron
(ME TOO)
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