iRacing has started running special events based off of real life races. Most recent was the iRacing Daytona 500, which was a full 500 miles with the A-class Impala. They did 2.4 hours at Daytona with the Riley and are going to do 120 minutes at Sebring with the Corvette soon.
Also the Mustang FR500C is coming soon and the 2009 Williams F1 machine...