Hi all bought a 2013 Boxster S with 20 inch wheels. Right now with 16,000 miles the Pirelli doe not have much thread left. Planning on pleasure driving and track driving about 50/50. So what is the best street/track tire available for 20inch wheels? Right now it is not feasible to get a second set of 18 or 19 inch wheels and tires for track use only. Heard some pros and cons about using Michelin Plot tires on the track but any input is greatly appreciated.