So don't try it. I was trying to come up with a good tire solution, when I decided I'd try out my roommate's 17" wheels with an offset of 50. They have stock STi re070's on them. We got them on, and bolted up, and the car on the ground. They looked fucking sick, but alas, there was trouble. Even with my whitelines and agx's, I get far too much body roll for such wide tires to work as can be evidenced in exhibit A. Rolling the fenders is not an option, unfortunately. It just wouldn't do enough. Then you say "what about something with a milder offset?" well, the problem with that is, when we took them back off my car,my rear strut had a big clean spot on it from where the tire rubbed when I jumped on the car. So, sad as it may be, it won't work.
I have photos I'll post in a little while.
exhibit a
mod edit: More specific subject