I've had 225/50R16 tires on my 98 SVT for 80,000 miles with absolutely no rubbing issues. The fit is close but adequate. This is a topic that has had a lot of discussion in the past so there is a wealth of information available in SEARCH.
Some 99 SVT's had rubbing issues with the stock 215/50R16 tires and Ford published a TSB with part numbers for a revised rear wheel well liners with more room. Most have not had a problem though.
Try a SEARCH. You will learn far more than anyone can quickly post.
