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The majority of drivers compete in their regular street cars with little to no modifications. People also race from open wheel cars to trucks. Any car safe for use on the street is suitable for autocross. The cars must pass a safety inspection (battery not loose, seat belts in good shape, etc.)
Chattanooga Auto Auction
Dade County High School Tire Rack Street Survival http://www.motorsportreg.com/ event registration
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February 6, 2010
Solo or Autocross is an event where the driver's ability to control a car
is tested. A course is set up in a large parking lot defined by pylons. Each car takes
turns negotiating the course while being timed. Speed is kept down to what one would
experience on the street. Risk to the cars and drivers are very minimal. Drivers are asked
to take a shift working the course (picking up pylons that are hit) to keep the event
going. 
Car handling is more important than power. Skilled drivers in sedans often
beat the novice in sports cars. The cars are divided into groups based on preparation
(Stock classes--basically as delivered from the manufacture; Street Prepared
classes--suspension and external engine modifications; Prepared classes--major
modifications to suspension, body, and engine; Modified classes--purpose built race cars).
There are different classes in each preparation group which separates cars of different
potential (a Corvette in Super Stock does not race a Neon in E Stock, but the preparation
rules are the same). 