| There is a gasket and hole through the firewall in the passenger side fenderwell. Run the wire through there. It leads inside the kicksill all the way back to the paneling behind your door. The exact spot where will be a little different on a TT and a 2+2. I would use a 150-200 amp fuse on the line which allows more than plenty of power transfer within the 0 guages safety limits. The ground really depends on where you want to put the battery, just make sure that you also use 0 guage wire to ground it. And most important part of the whole thing is that you are going to need a battery isolater to run two batteries. This allows the alternator to charge the 2nd battery, but keeps the 2nd battery from sending any charge to anything but your sound system in the back. Otherwise you can have big problems from two batteries sending your electrical equipment power, and it puts a huge strain on the alternator. Hope this helped, if you've got any more questions let me know.
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