I understand that.The portals are a straight drop down of 4 or 6 inches. They do widen the track by 8 inches overall front and rear but should not change the front to rear track except for the larger tire diameter.
Its an even 4" per side. The included hub brackets don't add anything to original width from your stock hubs. You'll just tack on another 4" per side, making you 8" wider over all. That can be manipulated with different wheel offsets, but the portals do have a limit to how far of an offset you can use.I understand that.
However since new spindles/ knuckles are provided (and they are different front to rear) there’s potentially room to keep the added width to a minimum.