Momo is correct. If you use different batteries w/o an isolator you risk having a discharge or feedback, thus killing the entire car + system. Isolators work two-fold, first they allow you to drain the system battery w/o killing the starting system for the car, and second they allow you to isolate any stereo issues from the main power system of the car.
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Would I actually gain any benefit from dual battery with the power i'd be drawing?
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Most likely yes. Here's a quick test, look at all the amps you'll be installing and add up the total amperage of all of the fuses. This will give you a MAX amperage draw. The Cougar puts out something like 70-90 amps, with something like a 20 amp draw for the car. If the amps can pull more than the car can produce then a second battery will help, but it will not solve the issue. The only solution is to rewind the alt, and add more storage capacity. You're into the realm of higher end systems once you start talking 2 or more amps, and thus your costs increase exponentially.
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