stock wheels
325 section tires are pretty dang wide for the stock rims, I guess it would be possible but you would have weird wear patterns and would probably have rubbing issues. Check out the 295-70-18 tires. Those are gonna be your best bet.
I have 325/60/18 Nitto Terra Grapplers on my stock 05 FX4 wheels. They rub at full lock with a 2" level. I'm going with the 295/70/18 nittos next time and would have the first time, but was able to get a unbelievable deal on the wider tire. My opinion... the 295/70's look better.

