There is an ongoing argument about this and the affect on the rear diff. I personally wouldn't run anything with more than 0.5-1" difference.
On another subject do you still have the gold wheels l sold you years ago? Did they fit the foz? I would love to see a photo with them on
If they were xxr wheels gave them to a guy to sandblast and they are stiil with him needed the money for something and put them on hold , I just got a set painted they are rota p1s 18x 7.5 and 8.0 will I be ok so.