"Wider" shock tires? All of this is theoretical of course but I assume you are talking about (in essence) moving the front suspension pivots inward, along with the requisite sheetmetal changes. That would be a bit of a major undertaking and be somewhat expensive. Unless you prefer drag-style setup at the expense of some pretty good braking and handling characteristics. You can already fit a 325 up front with the right offset and no suspension mods.