i dont think he will need the deka as i said what i did with the saz but cant hurt any for sure..he is doin ok with 1600w on just that batt all stock and pickin up a deka 9a31 tom cause he is getting a aq2200
get a battery isolator like the stingers i sell and then put both of the c&d's in the trunk by the amp just isolate the trunk batteries from the front battery..idk what to upgrade fron batt to now tho any suggestions? i dont think a c and d would fit upfront