It's a lot of fun and the people are usually great.
SHEEESH!!!! You DONT have to go start modding your car to do this!!!! Be advised once you do, it's gonna be pretty hard to stay in the stock class....why not just go and have a good time! This is the PERFECT thing to go wring your car out with, totally casual and cheap!
Best advice I got, was leave your tire pressure alone, too high and you'll break traction, and too low and you'll deal with the tire "rolling over" on the edge. Leave it be.
Empty your trunk and stuff prior to going, since during inspection (mandatory) they'll ping you on any loose objects in the vehicle and trunk. Also, remove your driver's floor mat - it counts as a loose object.
It's good if you have a buddy to go with to help kill the time between heats, but the people are usually quite friendly and you'll have no problems striking up conversation.
Most course setups will vary but will fit right in with using second gear through the course, as it's a very forgiving gear. Watch as many runs as you can before your heat, learn the course (be sure to get there early, and take advantage of the opportunity to walk the course with everyone before the start), have someone explain what the cones laying on their sides mean,and the double-cone gates. Take your time the first run, learning the course, this is where most people blow it. Second run, be a bit more aggressive but watch the course, third run, GO FOR IT!!!
GOOD CALL, HAVE A BALL!!
Oh...cool extra's for ya.....
A nice little website with some videos (one -oncar camera I believe) of an '05 GT running some autocross course....STOCK, by the way......
http://www.throttlehorseracing.com/autocrossvideo.html
..and some pics of an autocross eventI went to a while back......you can find two Mustang GT's in the first picture if you look...which ran in Stock condition, by the way......
http://i5.photobucket.com/albums/y195/Torq/Stoop/SCCA_VA_01.jpg
http://i5.photobucket.com/albums/y195/Torq/Stoop/SCCA_VA_03.jpg
http://i5.photobucket.com/albums/y195/Torq/Stoop/SCCA_VA_08.jpg
http://i5.photobucket.com/albums/y195/Torq/Stoop/SCCA_VA_10.jpg
(that last car, theTR-6, has some pretty interesting Ford V8 power.. .....careful observers will note the Shaker hood scoop...)