PR's or not, there should not be any burnouts or stereo's blaring at a car show unless there are specific events for each. Stereos should only be heard while a car is being judged and only then if there is a ICE, SPL or Stereo category in the event. Burnouts are for specified areas and during competition or the track only, they are never cool to do in a parking lot full of nice cars.

Leave the music for the DJ's at the event (whoever they might be) and if you dont like the selection then too bad.

Just my .02 woth