after market axle question

this might sound kinda dumb but the lonestar axle for the 300ex says its adjustable from +2 to +4 The question is if the stock wheel base is 45 inches will it be 47 inches if its on the +2 setting.
I ask this cause i'm confused if it wuld be +2 inches wider on each side of the axle or would it just be 1 inch on each side that would make it +2. do you guys get what i'm saying its kinda confusing to me.

[nigsrig]

it means its adjustable from +2 to +4 on each wheel,,so you either get 2 or 4 inches per wheel

[Guy400]

Actually, on my Lonestar axle that's total width gained. My LSR is a +2/+4 which means that without the collars that they supply it's 2 inches wider than stock for a +2 and if you use their collars it makes it 4 inches wider than stock for a +4 designation.

[NJ300ex]

And also you said wheelbase. I think you meant width. Wheelbase is distance between tires and you know what width is.