I still can't comprehend how members who have been doing this for as long as they have still think that Street Prepared implies anything to do with the vehicles that run there being streetable. It's just a class category name. Nothing more. The only real streetable class categories are Stock, Street Touring, and Road Tire. Not that you can't have a streetable car in the other classes, but either they're not likely to be competitive or their build date preceded emission controls, etc.
Perhaps its because that was the original intent of the class, and in many parts of the country you can get away with many of the SP allowances on a street vehicle despite their illegality?
While the rules of the Street Prepared Category have remained essentially
the same, the laws governing various aspects of street-driven
vehicles have changed over time. The original concept of this category
as made up predominantly of street-driven vehicles has been rendered
inappropriate. The SCCA does not encourage or condone the breaking
of laws governing pollution control systems or the alteration of streetdriven
vehicles contrary to state and federal laws regarding their use. It
continues to be the responsibility of the individual to comply with such
state and federal laws.
My emphasis applied.