Need advice on my first car audio system.

[TJB]

First off my car is a 2002 nissan altima 2.5 (stock electrical). I will be installing 2 sundown sa-12's on a SK 1500.1 I know that my electrical system may run into problems with this amount watts. I will complete the big three and im open to upgrading my batt under the under, but I will not be buying a second battery. Will I run into and problems on this and if so what kind of battery should I get? Thanks!

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[TJB]

any advice?