yep do the big 3 in 0 gauge wire for sure, cheap upgrade and it helps a lot surprisingly.
i've got a sundown saz 2500 for sale if your interested and 2 batteries.. 100 per but let me know , just trying to help ya out.
Make sure you run 0 gauge power wire, ground all that ...
If you decide to go with XS look up what group number fits under your hood but you'll most likely want 1 or 2 bats if your running 3k rms