I’m in New Zealand so things are a little reversed compared to your USDM models.

This is really easy.

I have a big Orbital battery in my EVO 9 GT and wanted to keep it when I installed the HKS IC piping kit. It was a tight fit even with the factory pipe.

I firstly made a template of the bottom, top and side of the battery and worked out where it needed to sit.

I then removed the strut brace to make room to work

I then removed the factory battery tray, lined up the template and notched the sides of the tray.

I then drilled holes in the bottom of the tray and made up a new battery clamp to fit using large washers under the tray to support the clamp mounts.

I then extended the earths and used the after battery market terminals.

At the moment I’m using a bus bar off the second + terminal of the battery to attach the factory positive lead with the factor fusing. I do intend changing this and using some form of after market fuse block which then connects directly to the main + terminal to tidy it up.

The rubber shroud on the strut bar is good becuase it protects the + terminal

You will need:

Socket set
Solder
Soldering iron
Assorted ring terminals
Large washers
Hacksaw
Drill
Conductive material to make bus bar and material for batter strap
Potentially new battery hooks/rods
Assorted bolts and nuts
Power cable
Aftermarket battery terminals
Wire cutters and pliers
1-2hrs max








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that is a tight fit..
i moved mine to the trunk

 

It is tight, but not as tight as you would think, the orbitals are big batteries though.

I thought about the boot (have done it in other cars) but I have a custom install for my subs mounted in a false floor (and amp on the back of the seats) in the boot. So the battery would have made it look untidy plus limited what I could get in the boot like my golf clubs and rifles.

Also means you don't have the added weight of the cable and mounting hardware.

 

Good info, have to look into that with the ams piping.

 

good idea for those who are on the fence of getting a mini battery

 

I had the same problem i had to move it into the trunk

 

good one man you beat me to it