95 mustang stock electrical and alternator (130 amp) im going to be doing the big 3 upgrade and switching to a 200 amp alternator in the next week or so. which battery should i use as a secondary for my stereo? currently running a RF prime 1200.1 and RF prime 250.4 im pretty happy with this setup and if anything i may goto a bigger or punch series amp for my mids and highs...right now at full tilt my voltage drop is from 14.6 to 12.8 at idle and barely drops to 13.6 at full rpm.