Has anyone looked at the new Super Touring rules? Super Touring is the new name for the old B and D Prepared classes. The restrictors have been removed and the cars have been classed on a cubic centimeter (CC) per pound bases. STO is for 3.0 liters and above. STU is 3.0 liters and below. These two classes have National racing status and all IT cars 1985 and newer are eligible. These classes only need 180 entries this year to be eligible for the 2010 Runoffs.