I'm looking to upgrade my electrical in my RSX.. I have a khc1400 up front and khc2000 in the rear and don't have space for anymore batteries!! I want to ge a good 270amp alternator, will this be wise to do with only one battery in the rear? Rite now I gotta zx2500 on a DD 9518g.. Looking to upgrade to a bigger amp maybe a VFL 500.1 (all daily listening..no competition)