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Message: <blockquote data-quote="King Kong" data-source="post: 4030794" data-attributes="member: 584011"><p>Alright so i have a pair of 12 inch mtx thunder 4500 which are a combined 550 watts rms and they are gonna be powered by my kicker zx750.1 amp.  Do you guys think I need to make any upgrades to my cars electrical system to power these.  I have a 99 plymouth breeze with i believe a 90 amp alternator.  Ive heard about the big 3 or a deep cycle battery, do i need these for only 550 watts and if so where are some good places to buy a battery and can most car shops do the big 3 upgrade?  thanks</p></blockquote><p></p>

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