Yes, this I know. I'm not going to autox the thing or anything of that nature thus why I'm keeping the stock size. Going to keep the wheels inside the fenders like stock, so rocks and other items in the road do not have a chance to ding up my quarter panels. My Evo x as well as the STI had a huge problem with this when you went aftermarekt with too much offset and even some with the stock wheels as well.Offset will depend on the width of a wheel you go with. You really should read the first post. Offset needs to be paired with the width or else its arbitrary. I'm running a 9in wide will with a 42mm offset and my wheels sit flush with the fenders. A narrower wheel will need a lower offset to accomplish the same look.
I plan on taking the stock tires off and putting them on the new rim.