Just show up.
If your doing just the SQ all the judges will do is listen to your car. If you want to do install and SQ you will have to do a short presentation on your install. Why you did what and stuff. Very simple really. It is best to have photo's of you install if you plan on doing install. Judges mainly need to make sure your car is not a fire hazard.

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"I have a 1500 watt hair dryer, but it sounds like sh!t"