MT Baja ATZ 325/60/R18
 

I have already made a post in the 2004+ forum about the fact that i'm about to get a slightly used set of these tires, and I want to know opinions and will these rub with my 2.5" AS??

You should be able to fit those easily, depending on the wheel you use. If you use an 18x9 inch wheel with 5 to 6 inches of backspacing, you should be fine (I'd suggest 5.5 or 6 inches).

I should've noted that I want to mount these on my stock 18" FX4 rims. I doubt they will rub, but I was curious if anyone had them so I could know for sure. Also I'm curious about how they ride, perform on road with various conditions, perform off road, and how they wear.

You shouldn't have any rubbing but you really need a wider wheel for a 325mm wide tire.

Well I like the wheels that came with my FX4 and I plan on keeping them. Is the 325 a serious issue or will they just wear funny?

Sometimes running a tire on too narrow a wheel can cause the center portion of the tire's tread to wear faster than normal, similar to running too much air pressure. A few members here are running 325's on OEM wheels however. How much, if any, it will shorten treadlife is unknown.

325 is deffinitley wide for a stock tire! 13 inches on a 8 inch rim.
the tire will look very boubley ( if thats a word)
check out some 18 inch helos or something they are pretty cheap.