As someone who definitly sees his headlights dim when the bass hits, I was wanting to get some opinions on a dual battery setup in the 525i.

We are all lucky enough to have two mounting points. Either under the hood or under the back seat right? Whether you are using one or the other.

My factory spot is under the hood, but my rear seat mount is not being used.

Instead of the 3 farad cap that I have under there currently, I was thinking about using the lucky setup that I have and installing a second battery under the rear seat as well.

I have read (exhaustively) other articles on dual battery setups, and wanted to get the final word from this board.

I have two power leads (one black and one red) that I will attach to the new secondary battery at the rear seat, keeping their 12volt power supply in tact.

I will vent it as it should be with the factory tubing and the tubing supplied by the battery maker.

I have identical (age and type) batteries as I am not going to be isolating them. I am aware of the possibility of having two batteries and stil needing a jump without the isolator.

My question is this........

Do you forsee any problem specific to BMWs? I have had the two rear power wires connected to my cap for years, so why would connecting them to my rear battery be any different.

I searched the board for "dual battery" and so on with little success. If anyone knows of a good thread, I would appreciate it.

Other than that, just wanting to hear people shoot holes in my idea to increase my amps while keeping it at 12 volts.

(I run two soundstream amps that really make my lights dim).

Hopefully there are no threads about dual batteries in the e34, so this will be the first.