15x8J lowest possible offset without doing any bodywork?

The title pretty much says it all, what's the lowest possible offset I can get without having any issues with rubbing, and not having to do any bodywork like fender rolling or stretching? I want to go wider!

And what's the highest ET possible? Without having problems the other way around.

No one with wide wheels in here?

Around 25 mark expect arch work but with 8j it's gunna be tricky to get them under without any mods at all mate.