need help with car upgrades?

rofl

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i have a toyota tacoma 1999
1800 rms W sub and 1800 rms W amp @ 1 ohm
big 3 upgrade
stock alternator 70 amps
battery

im looking at buying a extra optima yellow top battery and putting it in the back seat of my car or somewhere. How do i know what battery I should buy so it has enough power?
 
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