Yeah I understand that I've got to worry about the driving part more than the mods right now. I'm just trying to learn what options I'll have maybe come next spring when I'm getting ready for a full season of competition.

So it's possible to fit a 225/45/15 tire to a 15x6 rim...without violating 13.3 G (without modification)? I suppose the modification part refers to fitting in the fender well.