Vehicle Submodel

This is the model variant or trim package in which a car is equipped. 

Usually this is as simple as whether your car has a Turbo or not, but other times it is a bit more complicated.

The same model family car with a different trim package can use vastly different parts.  For example, a S60R and a S60T5 have completely different interior, exterior, suspension and even different engines and transmissions.

Full Turbo models tend to have a more luxurious trim package than Light Pressure Turbo or non-turbo models.