I bought these on the 4th of July (I even have the receipt still), and have only put 500 miles on them. The only reason I'm selling them is because I'm going back to 17" wheels and I need to buy them in 17's now.

235/40/18 Nitto NT-05
These are great for autocross or track use (on the same level at Dunlop Star Specs and Bridgestone RE-11's).
Overview: http://www.nittotire.com/#index.tire.nt05.overview
Specs: http://www.nittotire.com/#index.tire.nt05.sizes

$600