you can...you just may want to be careful with the volume output on the headunit.
just get the aftermarket wire harness adaptor and wire everything up color for color.
The amp gets it's siginal from the high level output of your headunit and the amp does all the work to make the sub a sub.
You will not be able to control the sub separately from the rest of the system but you can still keep the sub.
Highly suggested that you do the sub mod after this...bumps up the sub quite a bit.
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