Larger diameter tire. 205/60/15 on stock wheels or a 205/55/16 on 16" wheels. Adds abuot 5%-ish to the od of the tire. This DOES make the speedo read 5% too slow, but if you can do a little math in your head you can always be right on. Any bigger (had 205/60/16 for a week) and you're affecting the final drive too much in the wrong direction.