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Thought I'd share my experience from this past week. I started by installing the Big 3. I did this by either replacing or in some cases simply adding thicker (0 or 4) gauge OFC wiring. The alternator positive to the battery +. The both negative connections at the battery going to the chassis and motor. Plus I also upgraded a few other ground points that we're easily accessible. When dealing with the grounds, I made sure to clean up the area and remove any paint at point of contact. You'll also notice I added an inline fuse between the alternator and battery. This is a personal choice...to each their own. Next up I decided to add a 2nd battery (XS Power XP750) at the trunk. For this I ran a 4 gauge OFC wire from the battery to a Rockford Fosgate Circuit Breaker through the firewall (which IMHO is the hardest part of the job) and all the way to the trunk. I then connect it to a Battery Isolator (Smart Voltage Stabilizer).

Next up I decided to add a 2nd battery (XS Power XP750) at the trunk. For this I ran a 4 gauge OFC wire from the battery to a Rockford Fosgate Circuit Breaker through the firewall (which IMHO is the hardest part of the job) and all the way to the trunk. I connect the wire to a Battery Isolator (VSR - Voltage Sensitive Relay) which finally gets connected to the 2nd battery.

Note: Power Wire goes from - Main Battery > Circuit Breaker (or inline fuse) > through firewall, trim, etc. > Battery Isolator (or Voltage Sensitive Relay) > 2nd Battery

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In regards to brands and where I obtained everything - I used wiring, terminals, installation accessories, heat shrink, etc. from Knukonceptz, Down4Sound & Amazon.
Parts - Kolossus Kandy Kable 0/4 gauge OFC wire, Bassik 0 gauge in-line fuse holder w/150 amp fuse, Rockford Fosgate 200 amp Circuit Breaker, XS Power XP750-CK Install Kit (includes battery, 511 mount, inline fuses and wiring), 140 amp Dual Battery Isolator (VSR - Voltage Sensitive Relay), 0 & 4 gauge pin adapter inputs, Set Screw Ring Terminals 4 gauge pair w/heat shrink, input 0 to 4 gauge reducers, 0 & 4 gauge Crimp Rings, KnuKonceptz Ultimate Negative Battery Terminal, 1/2" black wire sleeve, 1" blue wire sleeve, KnuKonceptz Heat Shrink, Heat Shrink w/adhesive.

Up next?
Replacing front speakers with JBL GTO609c & rear with Polk Audio DB652. These will be powered by either a Massive Audio BP800.4 or Taramps 800x4 w/the help of AudioControl LC7i. For bass I have a 15" Soundqubed DVC 2 ohm 1,200 watts RMS subwoofer which will be powered by either a Hifonics BRX2016.1, Taramps HD3000 or Massive Audio BL3 Mono Amp (1,400 watts RMS)...All 3 can be wired at 1 ohm!
 

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Discussion Starter #2
On a side note...to help seal the grommet i used a thin piece of rubber (less than a 1/4 inch) that has adhesive backing on one side.
 
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