I recently went from 17" FSVT wheels (~22 lb's) with 215/45-17's to 18" OZ Racing Superleggra's (~16 lb's) and 225/40-18's and can say that there is a noticeable increase in acceleration with the new 18" OZ's even with the bigger tires. Handling feels great as well. As far as braking I'm running 13" Baer fronts so that's not really a problem.