dual batteries in a 2000 monte carlo

So im thinking of setting up a dual battery setup in my 2k monte carlo. system includes 1 ref7541a, and 1 ref611a. I dont want to have to upgarde my stock altenator, actually im not even sure what its putting out for amperage. I also have a neon undercar kit, and 6 tubes placed on the interior. If i wire the batteries in parallel will i be ok? I plan on using two optima red tops, and aside from running 4awg through the car on the positive side, one of the Audiobahn reps suggested running a ground cable to both batteries as well as grounding on each end. So what do you think? does this setup sound effecient or are there other things i need to take into consideration. also, would it be more cost efficent to just run two 1.2farad caps? (i say two because i can get the tsunamis very cheap through my place of employment). any advice will be greatly appriciated! Thnx in advance 

uhh...i'm sure most people are gonna say, upgrade the alt. both the dual batteries or dual caps are gonna add extra strain to the alt. and if u have a neon underglow kit as well as a sound system (how big of a system?) your gonna have to consider a bigger alt sooner or later anyways.

what a capacitor is is basically a limited power source until a battery powers back up to a workable level.

it cannot boost your system it can only be a backup so in reality it could appear to be boosting you system but all it really is doing is keeping a constant current and voltage running from your battery as opposed to the usual fluxes, but If you have decent wiring and a solid battery/alternator, you won't need a cap

///alpine