shannon

you would be best to run 70mm2 cable, i ran 95mm2 cable and get 0.8v voltage drop front to back,

For the average joe who can't pilfer this type of cable through work, wouldn't it be smarter to spend $400 on a gear reduction starter (that uses minimal current) as opposed to massive 95mm2 cable! lol

it would be a help but you will still have a voltage drop with the battery in the boot
as ratta states" a reduction drive starter " along with that i would leave the battery in the front unless you dont have the room in your engine bay as it may be more of an issue along with extra work to make the battery in the boot LEGAL eg seal boot ,vent battery to the outside,brackets  battery boxes ect ect ect