SCCA is considering adding Pro Touring classes.

[DTM Racing]

Even though ESP is a "prepared" class, the biggest limitations are to drive line and suspension pick up points.
-Drive line must retain factory long block and cam, and can be overbored no more than .043
-No relocation of suspension pick up points, and bushings cannot be made of metal.

[soloracerSD]

ESP is a STREET PREPARED Class E-Street Prepared
Prepared countpart would be C-Prepared stripped down full tubeframe cars.then XP (SM is also unrestricted drive train.but and factory matching engine block..You probably already know this ..Many have read Street Prepared rules and Prepared rules and had them mixed and confused.Often happens when reading the rule book online...(: SM is where you can completely change your suspension but still must use factory mounting points.If anyone wants to read the rule book starting from page 81 to 113 helps a lot at explanning Street Touring,Street Prepared and Street Modified classes

Even though ESP is a "prepared" class, the biggest limitations are to drive line and suspension pick up points.
-Drive line must retain factory long block and cam, and can be overbored no more than .043
-No relocation of suspension pick up points, and bushings cannot be made of metal.