You would need to get a rca line out converter to take signal from your rear speakers to your amp. Then you might want to put some bass blockers in your door and rear speakers and change them out while you are at it. Watch some youtube there are a billion videos on this stuff.
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2013 5.0, Black, Auto, Procharger P1SC stg 2, 4.13'' pulley(8 psi), JMS bap, 3'' x pipe, Circle D 3c, Kooks axleback, BMR control arms. 593rwhp